1812

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May 11: British Prime Minister Spencer Perceval is assassinated.

September 15: Moscow's Military Governor Rostopchin orders the Russian capital to be evacuated and burned down in advance of Napoleon's invasion.

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File:Siege of Badajoz, by Richard Caton Woodville Jr.jpg

March 16 – April 6: Siege of Badajoz

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Events

January–March

January 1 – The Allgemeines bürgerliches Gesetzbuch (the Austrian civil code) enters into force in the Austrian Empire.<ref>Template:Cite web</ref>
January 19 – Peninsular War: The French-held fortress of Ciudad Rodrigo is stormed by the Anglo-Portuguese Army, under the Earl of Wellington.<ref>Template:Cite web</ref>
February 7 – The last New Madrid earthquake strikes New Madrid, Missouri, with an estimated moment magnitude of over 8.<ref>The Enigma of the New Madrid Earthquakes of 1811–1812. Johnston, A. C. & Schweig, E. S. Annual Review of Earth and Planetary Sciences, Volume 24, 1996, pp. 339–384. Available on SAO/NASA Astrophysics Data System (ADS)</ref>
February 12 – Napoleon authorizes the usage of Mesures usuelles, the basis of the metric system.<ref>Template:Cite web</ref>
February 13 – The first Chilean newspaper Aurora de Chile deals with political philosophy, and stands in favor of the new national government.<ref>Template:Cite journal</ref>
February 27
- Argentine War of Independence: Manuel Belgrano raises the Flag of Argentina (which he designed) in the city of Rosario, for the first time.Template:Cite book
- English poet Lord Byron gives his first address as a member of the British House of Lords, in defense of Luddite violence against industrialism, in his home county of Nottinghamshire.<ref>Template:Cite web</ref>
February 24 – Prussia and France sign the Treaty of Paris, a military alliance.<ref name=Koch>Template:Cite book</ref>
March 14 – Prussia and Austria sign the Treaty of Paris.<ref name=Koch/>
March 15 – Luddites attack the wool-processing factory of Frank Vickerman in West Yorkshire.
March 16–April 6 – Siege of Badajoz (Peninsular War): The Anglo-Portuguese Army, under the Earl of Wellington, besieges Badajoz, Spain and forces the surrender of the French garrison.<ref>Template:Cite book</ref>
March 19 – The Cortes of Cádiz creates the first modern Spanish constitution.<ref>Thiessen, Heather. "Spain: Constitution of 1812." Encyclopedia of Latin American History and Culture, vol. 5, p. 165. New York: Charles Scribner's Sons 1996.</ref>
March 26

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The original Gerrymander

- In the United States, the Boston Gazette prints a political cartoon coining the term Gerrymander, after former Massachusetts Governor Elbridge Gerry's approval (on February 11) of legislation creating oddly shaped electoral districts, designed to help incumbents win re-election.<ref>Template:Cite book</ref>
- The 1812 Caracas earthquake destroys Caracas, capital of Venezuela.<ref>Template:Cite web</ref>

April–June

April 4 – U.S. President James Madison enacts a 90-day embargo on trade with the United Kingdom.
April 8 – The capital of Finland is moved from Turku to Helsinki, when Russia's Tsar Alexander I signs an edict moving the Government Council of the Grand Duchy of Finland.<ref>Template:Cite web</ref>
April 30 – Louisiana is admitted as the 18th U.S. state.
May 11 – John Bellingham assassinates British Prime Minister Spencer Perceval, in the lobby of the British House of Commons.<ref>Template:Cite book</ref>
May 16 – Russian field marshal Mikhail Kutuzov signs the Treaty of Bucharest, ending the Russo-Turkish War (1806–12) and annexing Bessarabia to Imperial Russia.
May 25 – Felling mine disaster: A mine explosion at the Felling colliery near Jarrow, England, leaves 96 dead.
June 1 – War of 1812: U.S. President James Madison asks the U.S. Congress to declare war on the United Kingdom.
June 4 – Following Louisiana's admittance as a U.S. state, the territory by that name is renamed the Missouri Territory.
June 16 – New York State charters the City Bank of New York (later Citibank).
June 18 – The War of 1812 between the United States, Canada and the United Kingdom begins with US declaration.
June 22 – France declared war on Russia.
June 24 – Napoleon's Grande Armée crosses the Neman River, and invades Russia.<ref>Template:Cite book</ref>

July–September

July 12 – Americans invade Canada at Windsor, Ontario.
July 18 – Russia's Patriotic War – Battle of Klyastitsy: Kulnev defeats Oudinot, but sustains a mortal wound.
July 19 – Beethoven and Goethe meet each other in Teplice, Bohemia.
July 22 – Peninsular War – Battle of Salamanca: British forces led by the Earl of Wellington defeat French troops near Salamanca, Spain.
August 5 – War of 1812: Tecumseh's Indian force ambushes Thomas Van Horne's 200 Americans at Brownstone Creek, causing them to flee and retreat.
August 12 – Peninsular War: The combined English and Portuguese army under the command of Wellington enters Madrid, following the Battle of Salamanca.
August 15 – War of 1812 – Battle of Fort Dearborn: Potawatomi warriors overrun the United States fort in Illinois Territory.
August 16 – War of 1812: American General William Hull surrenders Fort Detroit, without a fight, to the British Army.
August 19 – War of 1812: Template:USS defeats the British frigate Template:HMS, off the coast of Nova Scotia. The British shot is said to have bounced off ConstitutionTemplate:'s sides, earning her the nickname "Old Ironsides".<ref>Template:Cite book</ref>
September 7 – Napoleonic Wars – French invasion of Russia – Battle of Borodino: The bloodiest battle of the Napoleonic Wars so far ends in a tactical victory for Napoleon. There are at least 70,000 casualties, with a minimum of 6,562 dead from the French Grande Armée alone.<ref>Template:Cite journal</ref>
September 14 – French invasion of Russia and Fire of Moscow: Napoleon's troops enter Moscow, which is deliberately set on fire by Muscovites, on orders of Fyodor Rostopchin. Later accounts report that France lost 40,000 troops during four days of fire between September 17 and 20, and that 20,000 Russian soldiers were killed in what would be described in 1876 as "the greatest example in history of national self-sacrifice for the destruction of an invader."<ref name=Fires>"Fires, Great", in The Insurance Cyclopeadia: Being an Historical Treasury of Events and Circumstances Connected with the Origin and Progress of Insurance, Cornelius Walford, ed. (C. and E. Layton, 1876) p. 67</ref>

October–December

October 9 – War of 1812: American naval forces under Lieutenant Jesse Duncan Elliott capture two British warships, Template:HMS and Template:HMS.
October 12 – The capital of the U.S. state of Pennsylvania is permanently moved from Lancaster to Harrisburg.<ref>I. Daniel Rupp, History of Lancaster County: To which is Prefixed a Brief Sketch of the Early History of Pennsylvania</ref><ref>(Gilbert Hillis, 1844; reprinted by Heritage Books, 1990) p. 434</ref>
October 13 – War of 1812 – Battle of Queenston Heights: As part of the Niagara campaign in Ontario, Canada, United States forces under General Stephen Van Rensselaer are repulsed from invading Canada by British and native troops, led by Sir Isaac Brock (who dies during the battle).
October 18–20 – Second Battle of Polotsk – Russians attack and defeat a Franco-Bavarian force in Belarus.
October 19 – Napoleon begins his retreat from Moscow.
October 23 – Malet coup of 1812: General Claude François de Malet attempts unsuccessfully to overthrow the Napoleonic régime in Paris.
October 24 – Napoleonic Wars – Battle of Maloyaroslavets: An inconclusive encounter between the French vanguard and a Russian force leads Napoleon to decide to retreat along the same line as his advance, with disastrous results.
November 3 – Napoleonic Wars – Battle of Vyazma: The rearguard of Napoleon's retreating army is defeated.
November 5 – 1812 United States presidential election: James Madison defeats DeWitt Clinton.
November 10 – 1812 United Kingdom general election: The Tory Party is victorious, under Robert Jenkinson, 2nd Earl of Liverpool.
November 15–18 – Napoleonic Wars – Battle of Krasnoi: Napoleon's retreating army is again defeated in a series of skirmishes.
December 8 – The M6.9–7.5 San Juan Capistrano earthquake affects Alta California with a maximum Mercalli intensity of VII (Very strong) to IX (Violent), killing 40 parishioners at Mission San Juan Capistrano.
December 14 – The French invasion of Russia comes to an end as the remnants of the Grande Armée are expelled from Russia.
December 18 – The first Spanish Christmas Lottery is drawn, in Cádiz; it will be continuing more than two centuries later. The first Lotería Nacional was drawn on March 4.<ref>Template:Cite web</ref>
December 20 – The first volume of Grimms' Fairy Tales is published in Germany.
December 29 – War of 1812: Template:USS defeats the British frigate Template:HMS, off the coast of Brazil.
December 30 – The Convention of Tauroggen is signed.