Editing Battle of Wagram (section)

==The second day==
=== Rosenberg's attack ===
Positioned on the left of the Austrian army, in and around the strategic village of Markgrafneusiedl, ''Feldmarschalleutnant'' Prince Rosenberg-Orsini was in command of the 18,140 men and 60 cannons of the IV Korps. In addition, attached to his force was the much-battered Advance Guard, under ''Feldmarschalleutnant'' Nordmann, reduced to around 6,000 infantrymen and some cavalry support,{{ref label|Advance Guard|Note 6|6}} as well as the 3,120 cavalrymen from ''Feldmarschalleutnant'' Nostitz's division.{{sfn|Castle|1990|pp=20–21}} Receiving his orders in due time, Rosenberg began to organise his attack, forming the IV Korps into three large columns, preceded by an advance guard. The first column was formed by Hessen-Homburg's brigade, 6 battalions strong, which was directed towards the village of Grosshofen. The second column was 16 battalions strong (12 regular and four ''Landwehr'' battalions) and included the brigades of Swinburn and Weiss, with the orders to move on to [[Glinzendorf]]. The second column was preceded by an advance guard under ''Feldmarschalleutnant'' [[Joseph Radetzky von Radetz|Radetzky]], 10 battalions and 10 cavalry squadrons strong. The third column, under Nostitz, was 30 squadrons strong and was directed to outflank the French, towards Leopoldsdorf. Setting these troops in motion towards 4:00, just as his orders stated, Rosenberg instructed his commanders to maintain absolute silence among the rank and file as they advanced but, despite this, the troops moved forward in some disorder and with a lot of noise.{{sfn|Rothenberg|1995|pp=175–176}}{{sfn|Castle|1990|p=68}}

[[File:Prince Franz Rosenberg-Orsini.jpg|thumb|left|200px|''Feldmarschalleutnant'' [[Prince Franz Seraph of Rosenberg-Orsini|Prince Rosenberg-Orsini]]. At the battle of Wagram, the 47-year-old Prince Rosenberg was in command of the Austrian IV Korps.]]
Opposite to them lay the III Corps, perhaps the finest of the French army, under the command of ''Maréchal'' Davout.{{sfn|Rothenberg|1995|pp=176–177}} Davout was in command of 31,600 infantry (divisions of Morand, Friant, Gudin and Puthod), 6,200 cavalry (divisions of [[Emmanuel de Grouchy|Grouchy]], [[Charles Joseph de Pully|Pully]] and [[Louis-Pierre Montbrun|Montbrun]]) and 120 cannon.{{sfn|Castle|1990|p=22}} Davout was unaware that the Austrians were moving to attack him, but he was himself preparing his attack, and thus his troops were ready for action. Puthod's leading elements, one regiment strong, were at Grosshofen, with Gudin positioned between this village and Glinzendorf, which was held by Friant, supported by Morand. The entire cavalry was positioned to protect the right flank of the Corps. To the French surprise, towards 05:00, the Austrians attacked, with Radetzky's leading elements pushing the French outposts out of Grosshofen, and then attacking Glinzendorf. Davout immediately ordered a counterattack on Grosshofen, with Puthod attacking frontally and Gudin from the flank, and made sure that the defenders of Glinzendorf steadfastly hold their ground, while releasing heavy musketry upon the slowly advancing enemy columns. Grouchy's [[dragoon]]s rode to face the enemy cavalry column, while Montbrun sent a part of his [[light cavalry]] division towards [[Obersiebenbrunn|Ober Sieberbrunn]], in a bid to outflank the Austrians. The sound of the cannon coming from Davout's sector interrupted Napoleon's breakfast, with the Emperor thinking that Archduke John must have arrived on the field of battle with his forces.{{sfn|Rothenberg|1995|pp=176–177}} The threat of Archduke John's arrival was overestimated, since French intelligence inaccurately placed the strength of this army at 30,000 men, instead of its actual 13,000 men.{{sfn|Castle|1990|p=68}} Napoleon immediately ordered [[Etienne de Nansouty|Nansouty]]'s and [[Jean-Toussaint Arrighi de Casanova|Arrighi]]'s [[heavy cavalry]] divisions from the Cavalry Reserve to that sector, followed by the Imperial Guard.{{sfn|Rothenberg|1995|pp=176–177}} Nansouty's horse artillery was the first to arrive and deployed on the right flank of the advancing Austrians, opening [[enfilade|enfilade fire]].<ref>Petre Lorraine 365.</ref>

Meanwhile, Archduke Charles was observing the entire operation. With Archduke John's reinforcements failing to materialise from the east and no sign of the III and VI Korps approaching from the west to take their intended positions, Charles realised that the unsupported Rosenberg was now too exposed and in an increasingly dangerous position. Charles thus ordered Rosenberg to fall back to his initial position at Markgrafneusiedl and assume a defensive posture there.{{sfn|Castle|1990|p=68}} This was no easy task and it took all the determination and skill of ''Feldmarschalleutnant'' Radetzky in coordinating a combined-arms operation to slow down the French onslaught, while the rest of Rosenberg's troops retreated. By 06:00, Rosenberg was finally back to his initial positions, but his two-hour action had cost him no less than 1,100 casualties.{{sfn|Rothenberg|1995|pp=177–178}}

Napoleon, who was by now present alongside Davout, reconnoitered the situation and, seeing that Archduke John's army was nowhere near the battlefield, ordered the reserves back to Raasdorf, leaving only Arrighi's [[cuirassier]]s and a battery of [[Canon de 12 Gribeauval|12-pounders]] with III Corps. The Emperor reconfirmed that he wanted Davout to take Markgrafneusiedl, but, instead of a massive frontal attack, he instructed the Marshal to launch a part of his men frontally against the position and a part in an enveloping move from the east, in order to take advantage of the gentle slope there. These new orders meant that Davout could not start his attack right away, as he needed to send a part of his troops east, where he had to bridge the Russbach stream, in order to allow his artillery to cross.{{sfn|Rothenberg|1995|pp=177–178}} Napoleon then issued orders to Oudinot and Eugène, instructing them to support Davout by pinning down the Austrian forces on the Russbach, once the IIIrd Corps began its attack.{{sfn|Castle|1990|p=68}}

=== Crisis at Aderklaa ===
{{cquote|That braggart [[Jean-Baptiste Bernadotte|Bernadotte]] has been doing nothing but blunders since yesterday.|20|20|Napoleon, commenting on the performance of Marshal Bernadotte at the battle of Wagram.<ref name="Nau60"/>}}
While Rosenberg was attacking on the left, ''General der Kavallerie'' Bellegarde, commander of the Austrian 1st Korps, also set his men in motion in time, just as his orders stated. He had begun his manoeuvre just after 03:00, moving south, out of his position along the Russbach line and at Deutsch-Wagram, Bellegarde formed a vanguard of three battalions and three squadrons, under the command of ''General-Major'' Stutterheim, which he sent towards Aderklaa. A strategic village that was surrounded by an earthwork, Aderklaa offered a strong defensive position and Bellegarde was naturally expecting to encounter stiff resistance from the enemy defending the village. He was much surprised to receive reports that the village was completely undefended and, after making sure that it was not a trap, Bellegarde immediately ordered his vanguard to occupy it. The 1st Korps commander then brought an additional force of 12 battalions of ''Feldmarshalleutnant'' Fresnel's division, which he deployed in two lines, behind the position and formed the rest of his Corps in a line between Aderklaa and Deutsch-Wagram. Liechtenstein's cavalry duly came up in support, taking a wide position behind 1st Korps, between Deutsch-Wagram and Süssenbrunn, but Bellegarde chose not move beyond Aderklaa. An immediate Austrian attack would have posed a serious threat to the stability of the French left wing, but Bellegarde had orders which stated that he needed to wait for the [[Grenadier]] Reserve to arrive and align itself on his right.{{sfn|Rothenberg|1995|pp=178–179}}<ref name=Nau55>Naulet 55.</ref>{{sfn|Castle|1990|p=69}}

[[File:Battle of Wagram - 4th Line Regiment storms Aderklaa.png|thumb|left|250px|Soldiers of the 4th Line regiment storm Aderklaa.]]
The task of defending Aderklaa belonged to ''Maréchal'' Bernadotte, commander of the [[Kingdom of Saxony|Saxon]] [[IX Corps (Grande Armée)|IX Corps]]. However, Bernadotte's largely inexperienced infantry had suffered greatly during the evening attacks the day before and many units had routed, retreating beyond Aderklaa. With his infantry reduced to some 6,000 men, the commander had difficulties rallying a part of his troop but he could still count on two reasonably valid Saxon divisions. As he would later explain, Bernadotte believed himself in an exposed position and thus took the initiative of abandoning Aderklaa during the night, retreating almost 1 kilometer to the southeast of the village, in a bid to draw closer to the rest of the army. Withdrawing without permission and without notifying Napoleon of his action, Bernadotte irresponsibly compromised the entire French position on the left. Towards 04:00, seeing that the enemy had taken position in and around the village, Bernadotte assembled his artillery in a battery of 26 pieces, which began to bombard Aderklaa, but the Austrian heavy artillery at Deutsch-Wagram responded by releasing a devastating [[counter-battery fire]], which knocked out 15 Saxon pieces during the following three hours.{{sfn|Rothenberg|1995|pp=178–179}}<ref name=Nau55/>

Meanwhile, an injured Masséna, leading his IV Corps from a conspicuous white [[Phaeton (carriage)|phaeton]], was also executing his orders and approaching the sector with three of his infantry divisions and his cavalry. In compliance with Napoleon's orders, Masséna's fourth infantry division, under General Boudet, had been left far to the south, defending the village of Aspern. The manoeuvre of IV Corps was hampered by the arrival of the leading battalions of the [[Konstantin Ghilian Karl d'Aspré|d'Aspré]]'s division from the Austrian Grenadier Reserve, which delayed Masséna's rearguard division, under General Legrand. Arriving with his other two divisions in the vicinity of Aderklaa towards 07:30, Masséna was spotted by Napoleon, who got into the Marshal's phaeton to consult with him about the situation they were facing and, after a brief discussion, the Emperor ordered the recapture of Aderklaa. Masséna instructed General [[Claude Carra Saint-Cyr|Carra Saint-Cyr]] to storm Aderklaa with his division and, seeing that the General delayed his action, trying to find a weak spot of the solid position, the Marshal hurried him forward for an immediate attack. The assault was led by the 24th Light and 4th Line regiments, which were followed by the excellent [[Grand Duchy of Hesse|Hessian]] Guard brigade. Further east, the still combat-worthy Saxon Corps, including the Franco-Saxon division of General [[Pierre Louis Dupas|Dupas]] also moved forward, in a bid to launch a supporting attack between Aderklaa and Deutsch-Wagram. The 24th Light and 4th Line successfully drove back the two Austrian battalions positioned before the village, which broke and caused some disorder in the Austrian first line. The French impetuously moved into Aderklaa and then tried to launch a pursuit beyond this position, but, as soon as they moved out of the village, they were met with sustained fire from Bellegarde's second infantry line. The two regiments withdrew to Aderklaa, where they were reinforced by the Hessian Guard brigade and ordered to hold the position. Not far away from this position, the attack of the Saxons also came to a grinding halt and these men were driven back, exposing the flank of the French troops occupying Aderklaa. At this moment, the Austrians enjoyed a substantial, albeit temporary numerical advantage in this sector, 44,000 men to the French 35,000. This was thus the right time for a general attack, but the Austrian military doctrine discouraged commanders from taking too much initiative, and Bellegarde chose to stick to his orders and wait for III Korps, whose leading elements were only just coming up, in line with the Grenadiers.{{sfn|Rothenberg|1995|p=179}}<ref name=Nau55-56>Naulet 55–56.</ref>

[[File:Battle of Wagram - Austrian grenadiers repulse Molitor.png|thumb|250px|Austrian grenadiers defend Aderklaa against French troops from Molitor's division.]]
Archduke Charles noticed the development on his right, from his observation post at [[Baumersdorf]] and promptly rode to Bellegarde with new orders. Charles then personally organised an attack on Aderklaa, with the combined elements of infantry regiment 42 (''Erbach'') of the 1st Korps and Grenadier battalions ''Scovaud'', ''Jambline'' and ''Brzeczinski'' from the Reserve Korps. The ''Klenau Chevaulegers'' from Liechtenstein's cavalry also charged in support of the infantry. This powerful attack drove Carra Saint-Cyr's defenders out of Aderklaa and the cavalry attack resulted in them joining the panic-stricken Saxons in a disorderly retreat. Masséna's cavalry, under [[Antoine Charles Louis de Lasalle|Lasalle]] and [[Jacob François Marulaz|Marulaz]] promptly stepped in to protect the retreating infantry, driving off the Austrian horse and then charging the artillery that the Austrians were preparing to deploy in front of Aderklaa. The Austrian gunners abandoned their pieces and fled, but Liechtenstein committed additional cavalry, which at once repulsed the French horsemen. Meanwhile, Masséna was preparing to retake Aderklaa with the division of [[Gabriel Jean Joseph Molitor|Molitor]], spearheaded by [[François-Joseph Leguay|Leguay]]'s brigade and the 67th Line regiment. These men soon found their advance barred by a crowd of retreating Saxons, with Masséna forced to order his men to fire at them, in order to clear the way. Molitor decidedly advanced towards his objective, despite the enemy fire and cavalry threatening his flanks and, after some bitter fighting, managed to retake the village towards 09:45.{{sfn|Rothenberg|1995|pp=178–179}}<ref name=Nau55-56/>{{sfn|Castle|1990|pp=69–70}}

Nevertheless, the Austrians had sufficient fresh troops in this sector and they soon launched fresh attacks, with elements of 1st Korps and the Grenadier Reserve. Despite having taken heavy casualties during his attack, Molitor resolutely defended the position and it took the numerous Austrians in the sector two full hours before they were able to finally expel him. As for the Saxons and great many Frenchmen, they continued their retreat, with the first fugitives and Bernadotte approaching Raasdorf, where they suddenly met Napoleon in person. For the Emperor, the sight of Bernadotte riding at the head of the disorderly mob and making no apparent attempt to rally his men, was the last straw. After a brief exchange of words, Napoleon sacked the Marshal, adding "A bungler like you is no good to me." The Saxon infantry was by then completely disorganised and it could play no further role in the battle, with only the cavalry and ten cannon still combat-worthy.{{sfn|Rothenberg|1995|pp=179–181}} By mid afternoon, some 12,000 panicked stragglers, French and Saxon were milling in the town of Raasdorf. The French centre-left was at breaking point.<ref>Arnold 142.</ref>

=== Klenau's flank march ===
[[File:Battle of Wagram - Klenau captures Boudet's artillery.png|thumb|200px|Klenau's cavalry captures Boudet's artillery during the morning combats on 6 July 1809.]]
In application of Archduke Charles's plan to take the enemy in a double envelopment, ''Feldmarshalleutnant'' Klenau, commanding VI Korps, and ''[[Feldzeugmeister]]'' Kollowrat, commanding III Korps, moved forward towards the French left. Both commanders had received their orders very late and both had a long distance to cover before they could reach their assigned positions. They did their best to comply but, given the difficulties of a long night march, their leading elements could only manage to arrive on the Austrian right between 07:30 and 08:00, three hours later than Charles had planned.<ref name=Nau55-56/>{{sfn|Rothenberg|1995|p=181}}

Klenau was the first to make contact with the enemy. His troops left [[Leopoldau, Vienna|Leopoldau]] towards 07:30 and subsequently deployed between [[Breitenlee]] and [[Hirschstetten]], driving in the enemy outposts in the sector. The only French force present here was the 4th division of the IV Corps, under ''Général de Division'' Boudet, some 4,600 men, to Klenau's 14,000. At 08:00, Klenau unlimbered his artillery and began to fire at the French, while sending forward [[Peter, Freiherr von Vecsey|Vecsey]]'s brigade from ''Feldmarshalleutnant'' Vincent's division to take the village of Aspern. Boudet saw this development and sent forward a battery of ten cannon, with orders to open [[enfilade]] fire and thus delay the enemy. This proved to be a very uninspired move, as Austrian [[hussar]]s suddenly came up and captured these guns. The French 56th Line regiment boldly charged the enemy horse and momentarily recaptured the guns, but they lacked horses to carry them back and the intense Austrian [[cannonade]] soon compelled these men to retreat and leave behind the artillery. After making a timid attempt to defend Aspern with the 93rd Line, Boudet then chose to retreat towards Essling and Vincent's division occupied Aspern, subsequently launching a determined pursuit. The Austrians soon came in range of the French heavy batteries placed on Lobau island, and the bombardment slowed down their advance, but they still pushed on towards Essling, which Boudet promptly abandoned towards 10:00.{{sfn|Rothenberg|1995|p=181}}{{sfn|Castle|1990|pp=70–73}}

The French retreated towards the Mühlau salient and to [[Groß-Enzersdorf]], in a bid to protect the vital bridges towards Lobau island. The Austrians then launched a probing attack on the bridgehead but were rapidly repulsed and subsequently contented themselves with bombarding the French supply train, causing some panic among the civilian suppliers. From his current position, Klenau was able to either strike in the undefended rear of the enemy army, some five kilometers away, or to attack the vital bridges towards Lobau island. However, the Austrian commander chose caution; his force was only about 14,000 men strong, a part of which was now in range of the numerous French heavy batteries on Lobau island and his orders provided for his Korps to keep itself abreast with Kollowrat's III Korps. Had Kollowrat moved forward himself, protecting Klenau's left flank, the Austrian VI Korps might have envisaged the continuation of its action, but, as things were, Kollowrat had not yet moved from his position between Süssenbrunn and Breintlee.{{sfn|Castle|1990|pp=70–73}}{{sfn|Rothenberg|1995|p=182}}

Indeed, further north, Kollowrat had been slow in moving forward with his numerous III Korps. He deployed between the villages of Süssenbrunn and Breintlee and thus threatened the French flank, which was defended only by Legrand's infantry division and some cavalry. Kollowrat finished his positioning manoeuvres only towards 09:30, when his men made contact with Prochaska's Grenadier division of Liechtenstein's Reserve Korps. For lack of orders, Kollowrat did not attempt an attack against the weak French left. In a move which was typical for Austrian tactics at the time, the 60-year-old Austrian commander had been busy securing his own rear, rather than thinking of any offensive action. He had cautiously left behind an entire brigade on the Bissamberg heights, facing Vienna, and detailed a sizable force to garrison [[Gerasdorf]], a village situated in his rear. He also sent a combined-arms force to occupy the village of Breintlee, to the south. Despite his sound tactical position, which allowed him to envelop Masséna's flank or even march towards the undefended [[Raasdorf]], in the rear of the French army, Kollowrat moved forward cautiously, contenting himself with bombarding Masséna's force with two batteries that he had positioned near Breintlee.<ref>Arnold 145.</ref>

=== The French reaction ===
[[File:Cuirassiers-Wagram.jpg|thumb|left|220px|French cuirassiers cheering while charging past Napoleon at the Battle of Wagram. The Emperor committed [[Étienne Marie Antoine Champion de Nansouty|Nansouty]]'s heavy cavalry division, in a bid to stop the Austrian menace on his left.]]
With the situation looking increasingly dangerous for his army, Napoleon reassessed the developments and probably noted that he was holding the central position of an increasingly curved battlefront. He first sent word to Davout to hasten his attack preparations against the Austrian left, but the most urgent matter was to stabilise his own battered left wing. The Emperor did not want to commit his valuable, fresh infantry reserves just yet, so he ordered Masséna to break contact with the enemy and take his IV Corps southwards and attack the Austrian VI Korps. Executing such a manoeuvre required great skill and incurred high risks, as it meant that Masséna's men would have to move in vulnerable march column formations, through a sector with numerous enemy infantry, cavalry and artillery. The departure of these troops also meant that an enormous gap would open up in the French line, which the Emperor ingeniously intended to fill by forming an enormous [[grand battery]], which would check enemy advance in this sector through a sustained [[artillery barrage]]. This required time and, with the Austrians from III Korps menacingly moving forward, Napoleon counted on ''Maréchal'' Bessières's cavalry to allow Masséna to disengage and the grand battery to deploy.<ref name=Nau60>Naulet 60.</ref>{{sfn|Rothenberg|1995|pp=182–183}}{{sfn|Castle|1990|p=73}}

Towards 11:00, Bessières received his orders, which provided for an immediate attack at the weak point of the enemy line, the seam between Austrian III Korps and the Reserve Korps, where only ''Feldmarshalleutnant'' Prochaska's thinly spread division was covering the wide position between Süssenbrunn and Aderklaa.  With the division of [[Jean-Toussaint Arrighi de Casanova|Arrighi]] sent in support of Davout, far on the right flank and the division of [[Raymond-Gaspard de Bonardi de Saint-Sulpice|Saint-Sulpice]] detailed to protect Masséna's IV Corps, Bessières brought forward his only remaining unit, the mighty 1st [[heavy cavalry]] division, under the skilled 41-year-old general [[Étienne Marie Antoine Champion de Nansouty|Nansouty]]. Napoleon also sent orders for the [[Imperial Guard (Napoleon I)#Cavalry regiments|Guard cavalry]] to come in support, but his orders seem not to have reached them at all. Circumstances were so dire on the French left that Bessières opted not to wait for the Guard cavalry and sent orders for an immediate charge.<ref name=Nau60/>{{sfn|Rothenberg|1995|pp=183–184}}{{sfn|Castle|1990|pp=73–76}}

[[File:Austrian Cuirassiers.png|thumb|150px|Austrian cuirassiers from the 4th Regiment stepped in to repulse the French heavy cavalry near Aderklaa.]]
It seems that [[Antoine-Louis Decrest de Saint-Germain|Saint-Germain]]'s brigade was left behind in reserve and out of the actual attack,{{sfn|Castle|1990|p=73}}{{sfn|Rothenberg|1995|pp=183–184}} so Bessières took Nansouty's remaining 16 squadrons, some 2,800 men, including [[Jean-Marie Defrance|Defrance]]'s [[Carabiniers-à-Cheval|1st and 2nd ''Carabiniers-à-Cheval'']] and [[Jean-Pierre Doumerc|Doumerc]]'s [[2nd Cuirassier Regiment (France)|2nd]] and [[9th Cuirassier Regiment (France)|9th Cuirassier]]s.{{sfn|Castle|1990|p=23}} The hastily formed squadrons rode forth, but the flat terrain of the Marchfeld provided them with little cover from the devastating fire unleashed upon them by Austrian artillery. The heavy horsemen eventually made contact with the enemy near the village of Süssenbrunn, but found the infantry prepared to receive them and their first charge failed altogether. Rallying the men for a second attempt, with the elite ''carabiniers-à-cheval'' leading the way, Nansouty pushed through, but many of his troopers were unable to follow, leaving many of the squadrons reduced to just a handful of men. It seemed at first that the charge would do some serious damage, especially when the Frenchmen managed to break and sabre the ''Grenz'' ''Georger'' battalion, thus creating a breach between the two Austrian Corps. In the end however, the effects of a cavalry charge against prepared infantry were always set to be limited and the cavalrymen made little further impression on the grenadier battalions, which were by now formed in tight, solid [[Infantry square|squares]].<ref name=Nau60/>{{sfn|Rothenberg|1995|pp=183–184}}{{sfn|Castle|1990|pp=73–76}}<ref name=Arn148-149>Arnold 148–149.</ref> Displaying some great tactical skill, Nansouty wheeled right with his men and fell upon the Austrian artillery line near Aderklaa. Meanwhile, Bessières was busy fetching the Guard cavalry, which was only just beginning to arrive and with which he was intending to launch a second charge. Virtually under Napoleon's eyes, a [[Round shot|cannonball]] brushed Bessières's thigh, unhorsing the Marshal, who violently hit the ground and lost consciousness. While Bessières was being carried away from the battlefield, Nansouty and his  ''Carabiniers-à-Cheval'' managed to capture an Austrian artillery battery but Liechtenstein duly sent his fresh cavalry, the 6th ''Rosenberg Chevaulegers'' and 4th ''Kronprinz Ferdinand'' Cuirassiers against them. The Austrians hit the now diminished and tired French cavalry in flank, wounding Defrance and sending his men reeling back to their own lines with heavy casualties. The [[light cavalry]] of the Guard, some 2,000 sabres, belatedly launched a brief charge of their own, but they were also repulsed by the prepared enemy. With Bessières presumed dead, Nansouty took command of the entire cavalry, but, not knowing the Emperor's directives, decided to pull his battered troop back. In all, the French cavalry charge had been very costly; for the entire day, Nansouty's division alone lost 1,200 horses killed or wounded and a great number of men out of action. However, it did allow Masséna to successfully disengage and gained time for the deployment of the grand battery.<ref name=Nau60/>{{sfn|Rothenberg|1995|pp=183–184}}{{sfn|Castle|1990|pp=73–76}}<ref name=Arn148-149/>

[[File:Guard Foot Artillery 1808.jpeg|thumb|left|150px|A 12-pounder from the French Guard foot artillery in action.]]
[[File:Drouot at Wagram.jpg|left|thumb|150px|Lieutenant-Colonel [[Antoine Drouot]], commander of the [[Imperial Guard (Napoleon I)|Imperial Guard]] foot artillery, leading the deployment of his guns at Wagram.]]
Napoleon was aware that the cavalry charge was a stopgap, so, while the [[heavy cavalry]] was busy blocking the advance of the Austrian infantry, he ordered General [[Jacques Lauriston]] to assemble a massive battery. Its objective was to pound the enemy, stop their advance and force them to abandon their position between Aderklaa and Süssenbrunn. Lauriston's battery was formed of 84 pieces,{{ref label|Grand Battery|Note 7|7}} including the entire 60 pieces of the Imperial Guard artillery park and 24 pieces supplied by the "Army of Italy".<ref name="Naulet 56">Naulet 56.</ref> The [[horse artillery]] of the Guard, six batteries of [[Canon de 6 système An XI|six-pounders]], [[Canon de 8 Gribeauval|eight-pounders]] and heavy 24-pounder [[howitzer]]s, under the command of Colonel [[Augustin-Marie d'Aboville]], was the first to come into action, towards 11:00. It was followed by the foot artillery of the Guard, four batteries of [[Canon de 12 Gribeauval|12-pounders]], under the command of Lieutenant-Colonel [[Antoine Drouot]], and, shortly after, by the pieces from the "Army of Italy". The grand battery was deployed on a single line, covering some 2 kilometers, with the "Army of Italy" cannon facing Liechtenstein's Reserve Korps, while the Guard foot artillery was in the centre, facing Kollowrat's III Korps and the Guard horse artillery extended the line southwards, facing the village of Breintlee, which was in enemy hands. As they unlimbered, the French guns were ordered to open fire at once and the relatively short range—350 to 550 metres—and the flat and sodden ground, which allowed [[Round shot|cannonballs]] to ricochet far, meant that results were almost immediate. Entire files of Austrian infantry and cavalry, sometimes as much as 20 men, were blown away with a single shot and in some cases the French were even able to use short-range [[Canister shot|case-shot]], which was devastating for the densely packed Austrian battalions. In order to put even more pressure on the enemy, the French battery was ordered to advance steadily, while maintaining the most intense fire. This move soon forced Kollowrat to begin pulling his forces back. Meanwhile, however, the Austrian artillery was releasing sustained counter-battery fire with the six and eight-pounders that formed Kollowratt's and Liechtenstein's Corps artillery. But it was above all the murderous [[enfilade fire]], coming from the two 12-pounder batteries near Wagram, barely one kilometer away, that did the most harm to the French artillerymen. Soon, some French gun crews were reduced to such a point that Napoleon asked for volunteers among the Guard infantry, in order to replace the losses. Discarded artillery matches soon lit up the ripe corn crops and some of the wounded on both sides, unable to crawl away to safety, burned alive where they stood.{{sfn|Rothenberg|1995|pp=184–185}}<ref>Hourtoulle 52.</ref>

While the cannon were roaring, ''Maréchal'' Masséna was near Raasdorf, forming his men for their march south. Towards 11:00, he rallied many of the men who had routed during the attack on Aderklaa and then had rations of brandy distributed, in order to boost morale.<ref name=Arn162>Arnold 162.</ref> With a part of his troops still fighting to keep Aderklaa, Masséna directed his men towards Essling, aiming to threaten Klenau's Corps, which was by now in an advanced position behind the French line, but which had made no attempt to threaten the rear of Napoleon's army. The passive posture of the Austrian Corps was due partly to a lack of orders to advance further and partly to the fact that Klenau's relatively small force was by now out of touch with the main Austrian force. Nevertheless, Masséna's task remained daunting. Some of his troops had to march no less than eight kilometers in vulnerable column formations, moving along the front of an enemy who had deployed numerous cavalry and artillery. Masséna displayed his usual skill and tenacity, using his available cavalry to screen his men and taking advantage of the high corn crops to hide his advance. The French troops, although out of range from enemy musketry, were under constant bombardment from the Austrian artillery. The Austrian cavalry attempted an attack, which nearly reached the carriage of Masséna, whose aides were forced to draw swords and defend him as French cavalry stepped in to repulse their Austrian counterparts. Towards noon, after marching some six and half kilometers in 90 minutes, the leading elements from Masséna's Corps, namely [[Jacob François Marulaz|Marulaz]]'s cavalry and Legrand's infantry were within sight of the enemy-occupied village of Essling.{{sfn|Rothenberg|1995|p=185}}<ref>Arnold 162–163.</ref>

=== Davout's flanking attack ===
[[File:Markgrafneusiedl - Kirchenruine (2).JPG|thumb|left|A modern photo of the tower at Markgrafneusiedl, which was the scene of heavy fighting during the second day of the Battle of Wagram.]]
While battle was raging on the western side of the battlefield, some 10 kilometers to the east, ''Maréchal'' Davout was preparing his attack, the manoeuvre with which Napoleon intended to win the battle. In order to gain a foothold on the plateau before him, Davout had to drive back the forces of Rosenberg's Austrian IV Korps. The two forces had already clashed during the abortive night attacks the day before and again earlier that morning, between 05:00 and 06:00, when Rosenberg made a surprising attack, which the French managed to repulse. Due in part to the fact that Austrian Corps on other sectors of the battlefield failed to attack at the same time, Rosenberg was forced to draw his troops back to their initial positions, occupying the plateau and the strategic village of Markgrafneusiedl, situated just below the escarpment. This village was the key position, which Davout had to take at all costs, in order for his manoeuvre to succeed. Despite his vast numerical superiority, Davout's mission was not easy, as the Austrians had a numerous cavalry and artillery available to support their infantry. Furthermore, the defensive position was solid, with the village of Markgrafneusiedl formed of sturdy stone houses and a number of large buildings, such as a disused stone church with a tall, conspicuous tower, a monastery and a mill, all of which constituted easily defendable structures. The only weakness of Rosenberg's position was its left side, where the plateau formed a gentle slope, descending northeast.<ref name=Nau62>Naulet 62.</ref>{{sfn|Rothenberg|1995|pp=186–187}}

While the French were preparing their attack, artillery on both sides opened up, with Rosenberg's batteries placed on high ground and at times behind earthworks.<ref name=Nau62/>{{sfn|Rothenberg|1995|pp=186–187}} Despite the superior Austrian tactical position, after about two hours of bombardment, the French managed to put out of action most of the Austrian pieces and cause fast-spreading fires in the village of Markgrafneusiedl.{{sfn|Castle|1990|p=77}} The fact that the French artillery won its duel with the Austrian artillery was due in part to the larger number of French high-calibre pieces, but most of all to their superior concentration of fire, with the artillery of French III Corps and II Corps cooperating and creating a deadly [[crossfire]].<ref name=Nau63>Naulet 63.</ref> By 09:30, Davout's troops were in position and ready to commence their attack. Initial orders provided that Davout should send his four infantry divisions in a frontal assault northwards, but early that morning Napoleon changed his mind, after reconnoitering the position in person and noticing that he could take advantage from the weakness on the left of the Austrian position.{{sfn|Rothenberg|1995|pp=186–187}} The new orders stated that two of Davout's divisions, those of Gudin and Puthod, were to advance from [[Grosshofen]] towards Markgrafneusiedl, forcing Rosenberg to commit a part of his forces in order to meet them, while the remaining infantry divisions, Friant's and Morand's, supported by Grouchy's and Montbruns cavalry divisions, would storm the plateau from the east. This order caused a significant delay, as the troops had to move to their assigned positions eastwards and artillery bridges had to be built, in order for the divisional artillery to be able to cross the Russbach stream. Commanding the Austrian forces in this sector, Rosenberg could rely on reinforcements from Nordmann's Advance Guard, and a numerous cavalry under Nostitz, all of which were placed under his direct command. He was also counting on support from the east, with Archduke John's "Army of Inner Austria" set to arrive on the battlefield, but so far these badly needed reinforcements had failed to materialise.<ref name=Nau62-63>Naulet 62–63.</ref>

[[File:Battle of Wagram - Davout orders the assault of Markgrafneusiedl.png|300px|thumb|Davout ordering the assault of Markgrafneusiedl. The commander of III Corps had his horse shot under him while leading his men from the front but continued his relentless attacks on the Austrian left.]]
The French began their steady advance between 09:30{{sfn|Rothenberg|1995|p=186}} and 10:00, their movement hidden from view by the thick smoke resulting from the intense artillery bombardment. On the right, Montbrun's cavalry had already advanced towards [[Obersiebenbrunn]], repulsing Fröhlich's Austrian cavalry elements and clearing the way for Friant and Morand, who began their enveloping manoeuvre against the enemy left. Rosenberg responded by redeploying his reserves to form a new flank: Mayer's brigade in first line, supported by Riese's brigade and Infantry Regiment 58 ''Beaulieu''. However, all these troops were drawn from Nordmann's Advance Guard, a Corps which had sustained heavy casualties the previous day. During this manoeuvre, Nostitz's cavalry, placed initially on the plain below the escarpment, were pushed back and forced up the slope of the plateau by Grouchy's and [[Charles-Joseph Randon de Pully|Pully]]'s [[dragoon]]s; the Austrian horse subsequently redeployed to protect Nordmann's flank. Meanwhile, Davout personally led forward the divisions of Gudin and Puthod, who were to storm Markgrafneusiedl frontally. The village was defended by three Austrian brigades (Weiss, Hessen-Homburg and Swinburn), supported in second line by Infantry Regiment 3 ''Erzherzog Karl'' and the ''Landwehr'' battalion ''Unter dem Manhartsberg''. The Austrian first line met the advancing columns of Gudin and Puthod with steady fire, which forced the French attack to a temporary halt. Further east, Morand, leading the French attack, faced a similar fate, when the Austrians launched a combined infantry and cavalry attack which forced the French to draw back and reform. The first Austrian line, the two regiments from Mayer's brigade, the 4th ''Hoch und Deutschmeister'' and 49th ''Kerpen'', supported by eight squadrons of [[hussar]]s from the ''Erzherzog Ferdinand'' regiment counterattacked and Morand's frontline regiments, the 13th Light and 17th Line were momentarily in a difficult situation. However, Friant was quick to react in support of his fellow commander, sending the [[Jacques Laurent Gilly|Gilly]] brigade against the now exposed flank of the Austrians. At this point, ''Feldmarshalleutnant'' Nordmann intervened in person to reestablish the situation and was mortally wounded while doing so, with the Austrian counterattack in this sector failing completely. The brave Nordmann was to be discovered moments later by the French in a ditch, where he was abandoned during the hasty retreat of his men, who sought refuge behind Riese's brigade, where they reformed. Despite being present in large numbers, the Austrian cavalry failed to launch a massed charge and instead launched several small-scale charges, which produced little effect. At this crucial juncture, Friant committed his entire division and, despite the failure of a first attack, soon managed to gain a firm foothold on the escarpment, pushing towards the tower at Markgrafneusiedl, a sign that the battle in this sector was turning in favour of the French.{{sfn|Rothenberg|1995|pp=188–189}}<ref>Naulet 63–64.</ref>{{sfn|Castle|1990|pp=78–81}}

[[File:Charles Étienne Gudin.jpg|200px|thumbnail|right|General Gudin, in command of Davout's 3rd Division, was instrumental in the attack of the III Corps.]]
In the meantime, Gudin and Puthod had also rallied their men and launched them in another attack against Markgrafneusiedl. They were met this time by Rohan's division from Rosenberg's IV Korps, which valiantly attempted to hold its ground, in a stubborn house-to-house defense, despite the fact that village was by now largely engulfed in flames. The French were equally determined and even senior commanders exposed themselves to the greatest dangers (Davout's horse was shot under him and Gudin was seriously wounded) in order to give heart to the men. French pressure and the fast-spreading fire forced Hessen-Homburg's brigade, which had been drawn up in support of Rohan's division, to evacuate the position and reform on the escarpment behind the village, closely followed by Gudin's [[skirmisher]]s. Combat did continue around the disused church, where Riese's battered brigade, infantry regiments 44 ''Bellegarde'', 46 ''Chasteler'', 58 ''Beaulieu'', nine battalions in total, was still holding out with remarkable tenacity and despite the fact that their commander, ''General-Major'' Riese, did not bother to show himself throughout the day. The church, with its conspicuous stone tower, was finally lost by the Austrians towards noon, when Friant managed to push through and link up with Gudin and Puthod, forcing the three Austrian regiments to withdraw, in order to avoid being outflanked. When Rosenberg failed to retake the tower with Hessen-Homburg's brigade, he decided to redeploy his entire force further back on the plateau and form a new line. This timely action temporarily stopped any further French advance. Seeing this development, Davout chose to force a decisive breakthrough and committed his ultimate reserve, the 3rd Heavy Cavalry Division. The Marshal ordered the heavy cavalry up the plateau west of Markgrafneusiedl, in an immediate frontal assault against the enemy line, rather than on the more favourable cavalry terrain east, where Grouchy, Pully and Montbrun were already operating. The 3rd Heavy Cavalry Division, a unit that the Emperor had attached to III Corps that very morning,{{sfn|Rothenberg|1995|p=189}} was led by 31-year-old ''[[General of Division|Général de Division]]'' [[Jean-Toussaint Arrighi de Casanova|Arrighi de Casanova]], who had no previous command experience at divisional level.<ref>Tulard (volume 1) 196.</ref> The division was formed of four cuirassier regiments, the 4th, 6th, 7th and 8th, totaling 16 squadrons and almost 2,000 men.{{sfn|Castle|1990|p=23}} Receiving his orders to charge immediately, Arrighi hastily formed his squadrons and led forward [[Étienne Tardif de Pommeroux de Bordesoulle|Bordessoule]]'s brigade up the slope, but once there, he found himself in the middle of enemy barricades and was, according to his own account, unable to deploy a single squadron. The steel-clad cuirassiers made several attempts to break the sturdy Austrian masses, but the terrain was not proper for such action and their best attempts came to nothing. Taking some 300 casualties after several frustratingly ineffective charges, Arrighi pulled his men back to safety down the slope and furiously set off to find Davout and protest against the orders he had given.<ref>Naulet 64.</ref>

[[File:Napoléon à Wagram.jpg|200px|thumbnail|left|Napoleon following the smokeline of Davout's columns. The attack of III Corps constituted the crucial French offensive at Wagram.]]
It was just after noon and, despite the failure of the French cavalry assault, Rosenberg was aware that his beleaguered line was about to give way, with possibly catastrophic consequences for the entire Austrian army. With his entire force already committed and no reserves, the Austrian commander could do little to prevent the seemingly unstoppable French onslaught. It was at this decisive moment that Archduke Charles personally brought reinforcements to his battered left wing: five battalions from Infantry Regiment 57 ''Joseph Colloredo'' and 15 ''Zach'', one battery of six-pounders, all drawn from Austrian II Korps and four squadrons of hussars, as well as the entire 8th ''Hohenzollern'' Cuirassier regiment, from the Cavalry Reserve. With the cavalry thus reinforced and placed under the overall command of ''Feldmarschalleutnant'' Nostitz, Archduke Charles ordered his horsemen to charge the enemy. At first, ''General-Major'' Wartensleben's brigade, the 3rd ''O'Reilly'' ''Chevaulegers'' and the 6th ''Blackenstein'' Hussars, charged Montbrun's first line, overwhelming the French 7th Hussars. The Austrians then made a dash towards Montbrun's second line, which made a surprising attempt to drive off the attackers with a carbine volley, which failed to break the impetus of the charge and sent the French horse reeling. As a result of his successful charge, Wartensleben was able to capture ten French horse artillery pieces. But the Austrian triumph was fleeting and Montbrun had carefully prepared a countercharge with his reserve and skilfully launched the 12th ''Chasseurs-à-Cheval'' frontally, while the 11th  ''Chasseurs-à-Cheval'' charged the ''O'Reilly'' ''Chevaulegers'' from flank. On the French side, Grouchy soon brought his dragoons in support and Nostitz was forced to counter them by committing ''General-Major'' Rothkirch's brigade, formed by the 1st ''Erzherzog Johann'' and 6th ''Riesch'' Dragoons. A massive, albeit brief, cavalry clash occurred and in the melee, both Nostitz and Rothkirch were wounded and the Austrians were driven back, leaving behind the cannon they had captured moments earlier and taking refuge behind the infantry. This was the major cavalry action of the battle and, despite the fact that the Austrians committed over 30 of their 40 squadrons present in the sector, the French gained the upper hand, thanks largely to their superior training for massed action. Charging by single regiments against an enemy who committed entire brigades and divisions in coordinated actions, the Austrians, although superior in overall numbers, had been overwhelmed, a testament to their chronic inability to coordinate large-scale cavalry charges. Towards 13:00, after the failure of his cavalry charge, Rosenberg reckoned that he was unable to hold out on his current positions and began organising a fighting retreat towards [[Bockfliess]], some {{convert|10|km|mi}} northwest.{{sfn|Rothenberg|1995|p=190}}

=== MacDonald's column ===
{{cquote|Why in the world didn't you charge the enemy when the decisive moment came?|20|20|General [[Jacques MacDonald|MacDonald]] to General [[Frédéric Henri Walther|Walther]], commander of the [[Imperial Guard (Napoleon I)|Guard]] cavalry.<ref>Sokolov 455.</ref>}}
[[File:Decisive attack at Wagram.jpg|thumb|300px|MacDonald's square attack column]]
Davout's successful flanking manoeuvre did not escape unnoticed. Despite the considerable distance, towards 13:00, Napoleon could see through his spyglass that the smoke line in Davout's sector was by now well beyond the clearly visible tower at Markgrafneusiedl, a sign that his men had managed to roll back the enemy's flank. With his left now stabilised following Masséna's successful disengagement, the Emperor began issuing orders for a general attack. Masséna was to continue his march south and vigorously attack Klenau around Aspern, Oudinot was ordered to prepare his Corps for an assault against the plateau and dislodge Austrian II Korps, Eugène was to take VI Corps against the enemy forces at Deutsch-Wagram, while MacDonald's V Corps was to draw closer to Aderklaa. During the night, MacDonald had been rejoined by the second division of his Corps and although theoretically 23 battalions strong, this force had diminished complements and could barely muster 8,000 men.{{ref label|V Corps|Note 8|8}} With this force, MacDonald was preparing to execute Napoleon's previous orders to storm the plateau near the village of Wagram, much at the same location where he had attacked the previous day, when he received new orders. These provided that MacDonald's force should head west, towards Aderklaa, and deploy to occupy the ground held by the Grand Battery.{{sfn|Rothenberg|1995|p=191}}<ref>Naulet 65.</ref>{{sfn|Castle|1990|p=82}}

[[File:Карта к статье «Ваграм» № 2. Военная энциклопедия Сытина (Санкт-Петербург, 1911-1915).jpg|thumb|400px|left|Operations on 6 July (in Russian)]]
Just before 13:00, MacDonald moved towards his assigned location, with eight battalions from Lamarque and Broussier's division deployed in line, forming the front line, with the other 15 battalions remaining in column, a formation which could more easily fend off the increasing menace poised by the numerous enemy cavalry. This unusual formation, some 800 metres long and 550 metres wide, was to be supported by the remains of the Grand Battery, which had orders to advance on its right and open intense fire against the Austrian line. [[Jean-Mathieu Seras|Seras]]'s division was also ordered in support of this attack and deployed some distance behind the column with one of the ''carabiniers-à-cheval'' regiments protecting its rear. The assigned objective of this prodigious mass of men was to bludgeon its way forward and take the village of Süssenbrunn, the seam between the Austrian Grenadier Reserve and III Korps. Once managed to take the position, they would drive a wedge between the two Austrian formations, pushing them apart. A powerful cavalry force was to protect either flank of MacDonald's formation, with [[Frédéric Henri Walther|Walther]]'s mighty Guard Cavalry Division protecting the right and [[Étienne Marie Antoine Champion de Nansouty|Nansouty]]'s 1st Heavy Cavalry Division protecting the left. [[Louis Michel Antoine Sahuc|Sahuc]]'s diminished cavalry division from the "Army of Italy" was also involved in this action.{{sfn|Rothenberg|1995|p=191}}<ref name="Nau66"/>

As MacDonald's lumbering column moved forward, Austrian artillery opened up against the accompanying French cannon, disabling 15 of them, before they even had time to unlimber and respond. The Austrian guns then focussed on MacDonald's slow-moving formation, whose deep ranks presented ideal targets. Seeing the French advance, Archduke Charles ordered his Corps commanders to refuse the flank of the Grenadier Reserve and III Korps. Liechtenstein ordered Steyer's brigade to deploy in an oblique position and release heavy musketry against the right flank of the advancing French column, while Kollowrat issued a similar order to the Lilienberg brigade, which fired musketry volleys against the left of MacDonald's men, while Austrian artillery was pounding the column's front line. However, by now the French had managed to dent the Austrian line and had only a few hundred metres to go before they could reach the strategic village of Süssenbrunn.<ref name=Nau66>Naulet 66.</ref>{{sfn|Rothenberg|1995|pp=191–192}}{{sfn|Castle|1990|pp=82–83}} With his force reduced to little more than half strength{{sfn|Rothenberg|1995|p=192}} and his battalions forced to form square in order to fend off three successive cavalry attacks from ''Feldmarshalleutnant'' [[Karl Philipp, Prince of Schwarzenberg|Schwarzenberg]]'s cavalry, MacDonald could go no further. He called upon the numerous cavalry available to charge and clear the enemy guns and infantry, who, according to his own account, were by now in a state of complete disarray and ripe for destruction.<ref name=Nau66/> On his left, Nansouty, who had apparently not been consulted regarding the placement and role of his division in the attack,<ref>Thoumas 37.</ref> had kept his men too far back, in order to protect them from the sustained enemy fire. When Nansouty arrived with his cuirassiers, the Austrians were prepared to meet them and the guns had already limbered and moved away to safety. The French cuirassiers charged [[Josef Philipp Vukassovich|Vukassovich]] and [[Franz Saint-Julien-Walsee|Saint-Julien]]'s divisions, but these men were by now formed in the sturdy mass formations, which were virtually invulnerable to cavalry.{{sfn|Castle|1990|p=87}}
[[File:La bataille de Wagram.jpg|thumb|The Chasseurs à cheval of the Guard charging Austrian dragoons.]]
Further north, protecting the other flank of MacDonald's column lay the fresh Guard Cavalry Division, which also received MacDonald's invitation to charge, but remained motionless, with its commander, ''Général de Division'' Walther, invoking a lack of orders from his direct commanders, either Napoleon or ''Maréchal'' Bessières. The Emperor was too far away from the action and Bessières had been wounded during his earlier cavalry charge and had been carried away from the battlefield, so the Horse Guards did not move. Towards 14:00, MacDonald's attack had ground to a halt and the opportunity to completely break the Austrian line in this sector came to nothing. Napoleon noted with disgust that it was the first time that the cavalry let him down, but, given the state of exhaustion and the losses sustained by the French forces, MacDonald would have probably been unable to follow up any breakthrough achieved by the cavalry anyway. Still, the resolutely led attack achieved Napoleon's main strategic goal, which was to pin down the Austrian forces in this sector, preventing Charles from reinforcing his battered left. Forced to concede that his attack had lost momentum, MacDonald did his best to shelter his remaining men from the enemy's intense cannonade. However, reinforcements were not far away: the Emperor sent in support Wrede's powerful Bavarian division, 5,500 men strong,{{sfn|Rothenberg|1995|pp=193–194}} as well as the elite ''[[Chasseurs à Cheval de la Garde Impériale|Chasseurs à Cheval]]'' and ''[[1er régiment de chevau-légers lanciers polonais de la Garde impériale|Chevau-légers]]'' regiments of the Imperial Guard, as well as the Saxon cavalry.<ref name=Nau67>Naulet 67.</ref> The Bavarian division quickly came up in support but exchanged fire with the enemy only briefly and it was solely the artillery that really came into action, as the Austrians were by now in full retreat. Behind the Bavarians came the Fusiliers of the "Young Guard", four battalion-strong, which were led by the Emperor's [[aide-de-camp]], General [[Honoré Charles Reille|Reille]], with strict orders to avoid "getting involved in any adventure".  With the support of the Guard, the Bavarians captured Süssenbrunn and they alone continued the pursuit beyond this village.{{sfn|Rothenberg|1995|pp=193–194}} The Guard ''Chasseurs à Cheval'' tried to halt the advance of the enemy but they were met by Liechtenstein's Austrian cavalry and, receiving no support from their fellow ''Chevau-légers'', they had to withdraw, coming away with only three enemy cannon.<ref name=Nau67/>

===Masséna's "Infernal Column"===
Meanwhile, Masséna had indeed made remarkable progress since 11:00, when he had begun disengaging from the struggle at Aderklaa and organising his march against Klenau. On the French left, Klenau, commander of VI Korps, was fully aware of Masséna's manoeuvre, stating in his post-battle report that he saw an "Infernal Column" advancing towards him. By 12:30, elements of IV Corps were at Essling and Masséna received the Emperor's dispatch, informing him of Davout's success and urging him to attack. Masséna sent [[Jacob François Marulaz|Marulaz]]'s cavalry to clear the enemy horse, which was pushing back Boudet's defeated division. Then, Marulaz fell upon and captured the Austrian battery which was bombarding the bridges over the Danube, sending the panicked gunners fleeing for their lives.  An Austrian countercharge from Walmoden's Austrian hussars sent the French horse reeling and recaptured the lost battery, managing to carry most of it, except two guns, to safety, before more French cavalry, this time from [[Antoine Charles Louis de Lasalle|Lasalle]]'s division, came up against them. The French cavalry attack halted the advance of Klenau's Korps and allowed the French launch an attack of their own against the village of Essling. Six weeks before, during the Battle of Aspern-Essling, the French had valiantly defended this village against several Austrian attacks; now they were ordered to take it from some 1,200 whitecoats. The village was in ruins, but the sturdy stone granary was still standing and represented a formidable defensive structure. Nevertheless, [[François Roch Ledru des Essarts|Ledru des Essarts]]'s brigade from Legrand's 1st division stormed the position and, after intense fighting, they secured Essling towards 14:00, sending the defenders fleeing towards Aspern. Masséna then took Aspern after a brief combat and, collecting his four infantry divisions, continued to press Klenau, sending [[Gabriel Jean Joseph Molitor|Molitor]]'s division towards Breitenlee.<ref name="Arn162"/> There, General [[Pierre François Joseph Durutte|Durutte]]'s division of the "Army of Italy", which had been sent to plug the gap between IV Corps and the rest of the army, had just taken the village of Breitenlee. Durutte's division was able to link up with Molitor.<ref name="Nau67"/>

Masséna had accomplished his mission and had no further orders to continue his action but, hearing the intense cannonade on his right, he understood that he needed to continue his attack. He detailed Boudet's division to march on Kagran, while his other three infantry divisions marched on Leopoldau. The corps cavalry preceded the infantry and Lasalle's squadrons caught up with Klenau's infantry near Leopoldau. There, the French cavalry met two Austrian battalions, already formed in solid masses. This formation was ideal for fending off enemy horse. Nevertheless, the French charged impetuously but achieved little. The first mass could only be dispersed after horse artillery came into action. Not long before 17:00, the cavalry moved against the second mass and it was during this action that the gallant Lasalle, one of the best cavalry commanders of his time, was shot dead. Marulaz took overall command of the cavalry and personally placed himself at the head of the 8th Hussars, in a bid to avenge the slain commander; the attempt failed and Marulaz was himself wounded and had to be carried away to the rear. This event, as well as the fact that the French were now under fire from the artillery of Austrian V Korps on Bisamberg heights, convinced Masséna to halt his pursuit. Towards 17:00 Klenau had succeeded in extracting his corps from the dangerous position next to the Danube and moved to relative safety behind the reserve V Korps, deployed on the Bisamberg heights.<ref>Naulet 70.</ref>

=== Austrian retreat ===
While ''Feldmarshalleutnant'' Klenau was being ousted from Essling, Archduke Charles received much-awaited news about the arrival of his brother on the battlefield. However, the news were disappointing: Archduke John of Austria and his 13,000 men, Charles's only hope for rescuing his collapsing left flank, would only be able to arrive towards 17:00, much too late to make any difference. By now, Charles was acutely aware that his troops would not hold out much longer. His three corps on the Wagram plateau (I, II and IV) had been in action for some ten hours. On his right, Kollowrat's III Korps, Klenau's VI Korps and the Reserve Korps were being pushed back. Crucially, he had no battle reserves with which to either support his battered line or to launch a counterattack of his own. Continuing to fight in these conditions would have spelled the end of the ''Kaiserlich-königliche Hauptarmee'' and, in Charles's view, the end of the Habsburg Empire. His only realistic option was to begin an orderly retreat, which he ordered by mid morning, directing each corps along its line of retreat.{{sfn|Castle|1990|p=85}}{{ref label|Retreat|Note 9|9}}

While MacDonald's attack was drawing the attention of the Austrians, the French launched their general attack. Napoleon committed Marmont's fresh XI Corps, sending these men to take position opposite to Austrian I Korps and fill the gap between the "Army of Italy" and II Corps. Moreover, towards 13:00, the French from Oudinot's II Corps had begun to advance frontally against the Austrian troops on the Wagram plateau. The mercurial Oudinot, who had been waiting for his orders to attack all morning, decided to wait no longer, despite the fact that he had not yet received his order. Opposite to Oudinot was Austrian II Korps. Having spent the entire morning doing nothing else than exchanging artillery fire with French II Corps, these men were relatively fresh. They were also in a very dangerous position. The commander of II Korps, the experienced ''Feldmarschalleutnant'' [[Prince Friedrich Franz Xaver of Hohenzollern-Hechingen|Hohenzollern]], could see that his force was in danger of being attacked from the flank by Davout's seemingly unstoppable corps. Now Oudinot was advancing against him. At first, Hohenzollern tried to hold on his initial positions and his men greeted Oudinot's advancing columns with intense musketry. However, the Austrian commander realised the fragility of his position, seeing that, on his left, all the Austrian troops were in full retreat and he ran the risk of having Oudinot pin his men down, while Davout was free to advance in his flank and rear. Hohenzollern thus had little choice but to order his men to fall back and form a new line further north, sending 5 battalions and several batteries from his second line to form a new flank and slow down Davout's two advancing divisions, which were drawing dangerously close to the strategic village of Baumersdorf.<ref name="Nau67" />{{sfn|Rothenberg|1995|pp=194–195}}

Seeing the Austrians in full retreat, Oudinot lost his composure and galloped along his line, shouting his commands, ordering his men to run at the enemy. One of the Corps divisional commanders, general [[Charles Louis Dieudonné Grandjean|Grandjean]], reiterated this highly unusual and potentially disastrous order, which would have resulted in the columns rapidly dispersing and becoming vulnerable to a counterattack. Luckily enough, the troops were commanded by experienced junior officers, who took over and executed the orderly manoeuvres that were required on such occasions. During this action, Oudinot was wounded twice and had his horse shot from under him,<ref name=Nau67/> but he retained his command and, after his surgeon dressed his wounds, he led his men on.<ref>Arnold 161.</ref> His troops stormed Baumersdorf, which they took, despite gallant defense from [[Ignaz zu Hardegg|Hardegg]]'s brigade. Oudinot's Corps then fanned out, with the bulk of his men continuing to press Hohenzollern and [[Jean Victor Tharreau|Tharreau]]'s division wheeling left against Bellegarde's I Korps. To the west, General [[Michel-Marie Pacthod|Pacthod]] and his division of the "Army of Italy", supported by the Italian Royal Guard, were able to manoeuvre unseen by following the riverline of the Russbach up the village of [[Deutsch-Wagram]]. There, they fell upon the unprotected flank of [[Konstantin Ghilian Karl d'Aspré|d'Aspré]]'s Austrian grenadier division, which had been left behind to cover Bellegarde, who had just begun to retreat, in accordance with Charles's orders. Surprising the grenadiers, Pacthod stormed the position and pushed the Austrians back in disorder beyond the village of Aderklaa. They were supported by Tharreau's division of II Corps, which had managed to storm the plateau next to the village. Bellegarde reacted by sending in some of his reserves to stop the enemy onslaught, but the French managed to secure both Wagram and Aderklaa, two key positions on the battlefield.<ref name=Nau67/>{{sfn|Rothenberg|1995|pp=194–195}}

By 16:00, the entire Austrian army was in full retreat. They executed this manoeuvre admirably, with the formations remaining cohesive and withdrawing in echelon, each formation protecting the retreat of the adjoining one. During this phased retreat, ''Generalmajor'' [[Josef von Smola (1764–1820)|Smola]], commander of the Austrian artillery had a major role, managing to mass a sufficient number of cannon to keep the enemy at a respectable distance. The French, who had been marching and fighting for over forty hours, under intense heat and with scarce rations of water and food, were slowly following the retreating enemy. The exhaustion of the French troops was such that, towards 16:00 a brief moment of panic occurred at Wagram. Dozens of French infantry fled down the escarpment, with the Old Guard forced to form square in order to protect the Emperor's headquarters, before order could be restored. A second such moment took place around one hour later, when a mounted scouting party from Archduke John's army suddenly appeared near Glinzendorf, causing panic among the stragglers and civilian contractors of the army, with the Guard again forced to form square. But John soon received word that the battle was already over and hastily retraced his steps.{{sfn|Rothenberg|1995|pp=196–198}} A final incident took place towards 18:00, when elements of the 108th Line regiment from Davout's Corps caught up with enemy stragglers at the Bockfliess. There, the French found the houses filled with drunken Austrian whitecoats, who refused to surrender and attempted to defend themselves. Some 200 of these men were slaughtered and 400 were captured.<ref>Naulet 71.</ref> By nightfall, contact had been broken and the exhausted French had to stop the pursuit and camp on their positions.{{sfn|Castle|1990|p=85}} Towards dusk, French cavalry caught up with Austrian III Korps and tried to block its retreat but the numerous Austrian cavalry in the sector promptly stepped in, hitting the enemy's flank and sending these horsemen fleeing. This persuaded Archduke Charles that he had left III Korps in an exposed position and ordered it to hasten their retreat and get in line with VI Korps. Towards 20:00 all combat ceased and the Austrians were able to move away without any further incident. Napoleon's forces had won the bloody Battle of Wagram.{{sfn|Rothenberg|1995|p=202}}