Editing War of the First Coalition (section)

===Prussian progress===
[[File:Léon Cogniet - La Garde nationale de Paris.jpg|thumb|''[[The National Guard of Paris Departs for the Army]]'' by [[Léon Cogniet]]]]
Brunswick's army, composed mostly of Prussian veterans, crossed into French territory on 19 August and easily took the fortresses of [[Longwy]] and [[Battle of Verdun (1792)|Verdun]].{{sfn|Holland|1911|loc=The revolutionary Commune of Paris}} But at the [[Battle of Valmy]] on 20 September 1792 they came to a stalemate against Dumouriez and [[François Christophe Kellermann|Kellermann]] in which the highly professional French [[artillery]] distinguished itself. Although the battle was a tactical draw, it bought time for the revolutionaries and gave a great boost to French morale. Furthermore, the Prussians, facing a campaign longer and more costly than predicted, decided against the cost and risk of continued fighting and determined to retreat from France to preserve their army.{{sfn|Holland|1911|loc=Battle of Valmy}}