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1812 ( MDCCCXII)
was a leap year starting on Wednesday of the Gregorian calendar and a leap year starting on Monday of the Julian calendar, the 1812th year of the Common Era (CE) and (AD) designations, the 812th year of the Anno Domini 2nd millennium, the 12th year of the 19th century, and the 3rd year of the 1810s decade. As of the start of 1812, the Gregorian calendar was
12 days ahead of the Julian calendar, which remained in localized use until 1923.
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 22 – Peninsular War – Battle of Salamanca: British forces led by Lord 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: The USS defeats the British Constitution frigate , off the coast of Guerriere Nova Scotia. The British shot is said to have bounced off the s sides, earning her the nickname "Old Ironsides". Constitution'
September 7 – Napoleonic Wars – French invasion of Russia – Battle of Borodino: The bloodiest battle of the Napoleonic Wars 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. September 14 – French invasion of Russia: 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." 
October 9 – War of 1812: American naval forces under Lieutenant Jesse Duncan Elliott capture two British warships, HMS and Detroit HMS . Caledonia
October 12 – The capital of the Commonwealth of Pennsylvania, United States is permanently moved from Lancaster to Harrisburg. I. Daniel Rupp, History of Lancaster County: To which is Prefixed a Brief Sketch of the Early History of Pennsylvania 
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 – U.S. presidential election, 1812: James Madison defeats DeWitt Clinton.
November 10 – United Kingdom general election, 1812: 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 20 – The first volume of is published in Germany. Grimms' Fairy Tales
December 29 – War of 1812: The USS Constitution defeats the British frigate HMS , off the coast of Java Brazil. December 30 – The Convention of Tauroggen is signed.
January 6 – Melchora Aquino, Filipino revolutionary hero (d. 1919)
January 13 – Victor de Laprade, French poet, critic (d. 1883)
February 3 – William Fraser Tolmie, Scottish-Canadian scientist, politician (d. 1886)
February 7 – Charles Dickens, English writer (d. 1870)
February 11 – Alexander Hamilton Stephens, Vice President of the Confederate States of America (d. 1883)
February 15 – Charles Lewis Tiffany, American jeweler, co-founder of Tiffany & Co. (d. 1902)
February 16 – Henry Wilson, 18th Vice President of the United States (d. 1875)
February 18 – Nils Johan Berlin, Swedish chemist, professor (d. 1891)
February 29 – Sir James Milne Wilson, Premier of Tasmania (d. 1880)
March 6 – Aaron Lufkin Dennison, American watch manufacturer (d. 1895)
March 22 – Stephen Pearl Andrews, American anarchist, abolitionist (d. 1886)
April 14 – George Grey, 11th Premier of New Zealand (d. 1898)
April 20 – Pauline Åhman, Swedish harpist (d. 1904)
April 22 – Solomon Caesar Malan, Swiss-born orientalist (d. 1894)
April 23 – Frederick Whitaker, English-New Zealand lawyer, politician, 5th Prime Minister of New Zealand (d. 1891)
April 29 – Emilie Högquist, Swedish dramatic star (d. 1846)
May 6 – Madame Restell, American abortionist (d. 1878)
May 7 – Robert Browning, English poet (d. 1889)
May 12 – Edward Lear, English artist, poet (d. 1888)
June 9 – Johann Gottfried Galle, German astronomer (d. 1910)
June 13 – Gustavus H. Scott, American admiral (d. 1882)
June 14 – Fernando Wood, American politician, U.S. House of Representatives from New York and 2-time Mayor of New York City (d. 1881)
July 2 – Nathaniel de Rothschild, French wine grower (d. 1870)
July 8 – Louisa Hamilton, Duchess of Abercorn (b. 1905)
August 8 – John Rodgers, American admiral (d. 1882)
August 27 – Bertalan Szemere, 3rd Prime Minister of Hungary (d. 1869)
September 2 – William Fox, 2nd Premier of New Zealand (d. 1893)
September 18 – Herschel Vespasian Johnson, American politician (d. 1880)
October 12 – Ascanio Sobrero, Italian chemist (d. 1888)
October 20 – Austin Flint I, American cardiologist (d. 1886)
November 14 – Aleardo Aleardi, Italian poet (d. 1878)
December 6 – Ana María Martínez de Nisser, Colombian heroine, writer (d. 1872)
December 8 – Henry Varnum Poor, American financial analyst (d. 1905)
December 14 – Charles Canning, 1st Earl Canning, British Viceroy of India (d. 1862)
December 17 – Vilhelm Petersen, Danish painter (d. 1880) December 24 – Karl Eduard Zachariae von Lingenthal, German jurist (d. 1894)
January 23 – Robert Craufurd, British general (mortally wounded in battle) (b. 1764)
February 2 – Isaac Titsingh, Dutch scholar, merchant-trader and ambassador (b. 1745)
March 7 – Isaac Swainson, English botanist (b. 1746)
March 11 – Philip James de Loutherbourg, English artist (b. 1740)
March 18 – John Horne Tooke, English politician and philologist (b. 1736)
April 20 – George Clinton, 4th Vice President of the United States (b. 1739)
April 25 – Edmond Malone, Irish scholar (b. 1741)
May 11 – Spencer Perceval, Prime Minister of the United Kingdom (assassinated) (b. 1762)
May 12 – Martha Ballard, American diarist and midwife (b. 1734 or 1735)
May 18 – John Bellingham, British assassin of Spencer Perceval (b. 1769)
July 4 – Victurnien-Jean-Baptiste de Rochechouart de Mortemart, French general and politician (b. 1752)
August 30 – George Mathews, American army officer and politician (b. 1739)
September 19 – Mayer Amschel Rothschild, German banker (b. 1744)
September 21 – Emanuel Schikaneder, German dramatist, actor and singer (b. 1751)
September 24 – Juana Galán, Spanish heroine (b. 1787)
October 13 – Isaac Brock, British general (killed in action) (b. 1769)
December 20 – Sacagawea, Shoshone guide (b. ca. 1788) December 24 – George Beck, American artist and poet (b. 1749)