* 1812 – British forces under the command of the Duke of Wellington assault the fortress of Badajoz.

* 1812 – Alexander Herzen, Russian writer ( d. 1870 )

* 1812 – The Territory of Orleans becomes the 18th U. S. state under the name Louisiana.

* 1812 – Kaspar Hauser, German mystery boy ( d. 1833 )

* 1812 – Bertalan Szemere, Hungarian politician ( d. 1869 )

* 1812 – War of 1812: The Battle of Fort Dearborn is fought between United States troops and Potawatomi at what is now Chicago, Illinois.

* 1812 – War of 1812: American General William Hull surrenders Fort Detroit without a fight to the British Army.

* 1812 – War of 1812: American frigate defeats the British frigate off the coast of Nova Scotia, Canada earning her nickname " Old Ironsides ".

He was one of the founders of the Geological Society of London in 1807 and was its honorary secretary in 1812 – 1817.

Andrew Johnson was born in Raleigh, North Carolina, to Jacob Johnson ( 1778 – 1812 ) and Mary (" Polly ") McDonough ( 1783 – 1856 ), a seamstress and the daughter of Andrew McDonough.

* 1812 – Peninsula War: A coalition of Spanish, British, and Portuguese forces succeed in lifting the two-and-a-half-year-long Siege of Cádiz.

* Alfonso Sanz y Martínez de Arizala ( 28 January 1880, Madrid – 1970 ), married in 1922 to María de Guadalupe de Limantour y Mariscal ( d. 1977, Marbella ), daughter of Julio de Limantour y Marquet ( 17 June 1863, Mexico City – 11 October 1909, Mexico City ) and wife Elena Mariscal y ..., paternal granddaughter of French Joseph Yves de Limantour y Rence de la Pagame ( 1812, Ploemeur – 1885, Mexico City ) and wife Adèle Marquet y Cabannes ( 1820, Bordeaux –?

* 1768 – Joseph Dennie, American author and journalist ( d. 1812 )

* 1812 – Agoston Haraszthy Hungarian-American traveler, writer, and winemaker, founded Buena Vista Winery ( d. 1869 )

* 1812 – Peninsular War: French troops engage British-Portuguese forces in the Battle of Majadahonda.

* 1748 – Joseph Schuster, German composer ( d. 1812 )

* 1813 – War of 1812: United States troops capture the capital of Upper Canada in the Battle of York ( present day Toronto, Canada ).

* Principality of Anhalt-Bernburg-Schaumburg-Hoym: 1718 – 1812

* August 20 – Henry Richard, Welsh peace campaigner ( b. 1812 )

* November 22 – Henry Wilson, 18th Vice President of the United States ( b. 1812 )

* October 5 – War of 1812 – Battle of the Thames in Upper Canada: William Henry Harrison defeats the British, and native leader Tecumseh is killed in battle.

* November 3 – The Treaty of St. Louis ( 1804 ) is signed by Quashquame and William Henry Harrison ; controversy surrounding the treaty eventually causes the Sauks to ally with the British during the War of 1812 and is the main cause of the Black Hawk War of 1832.

The three leading candidates were William Henry Harrison, a war hero and the most successful of Van Buren's opponents in the 1836 election ; Winfield Scott, another general, a hero of the War of 1812 and active in skirmishes with the British in 1837 and 1838 ; and Henry Clay, the Whigs ' congressional leader and former Speaker of the House.

After several years of closure resulting from an economic depression after the War of 1812, Queen's College reopened in 1825 and was renamed Rutgers College in honor of American Revolutionary War hero Colonel Henry Rutgers ( 1745 – 1830 ).

( His father, Benjamin Henry Latrobe, was the architect who rebuilt the United States Capitol in Washington, D. C. after the War of 1812.

He became allied with fellow Kentuckian Henry Clay as a member of the War Hawks faction that favored war with Britain in 1812.

To end the War of 1812 John Quincy Adams, Henry Clay and Albert Gallatin ( a leading anthropologist ) and the other American diplomats negotiated the Treaty of Ghent in 1814 with Britain.

There he became a judge and subsequently Adjutant General of the United States Army under General William Henry Harrison in the War of 1812.

* Henry Thompkins Anderson, ( 1812 – 1872 ), a Christian Church ( Disciples of Christ ) clergyman who translated the New Testament and Codex Sinaiticus

The county was named for Captain Eleazer D. Wood, the engineer for General William Henry Harrison's army, who built Fort Meigs in the War of 1812.

It was named, as was its county seat, after Henry Leavenworth, an officer in the War of 1812.

The county was named for William Henry Harrison, the first governor of Indiana Territory, and later a General in War of 1812, hero of Tippecanoe, and the 9th U. S. President.

It was named for Dr. Henry Dearborn ( DR ), an officer in the Revolutionary War and the War of 1812.

General William Irwin, a hero of the War of 1812, was granted several thousand acres of land in nearby Henry County.

In 1857, the town of Clayton was laid out and founded by Joel Henry Clayton ( 1812 – 1872 ) and his two younger brothers.

The Battle of the Mississinewa was fought in December 1812, just north of the current city of Marion, as an expeditionary force sent by William Henry Harrison against the Miami villages.

While the list of those serving has not been preserved, among those who are known to have been in the Continental army were Thomas Thompson, Major Thomas Frothingham, Ebenezer Lane, Daniel Peck, David Arnold, Henry Wetby, Joseph Huntington, John Croat and Robert Burroughs: Among those serving in the War of 1812 were Peter Sipperly, Philip Snyder, Paul Wattenpaugh and Philip Lafite.

During the War of 1812, the west shore of Cunningham Island was made a military rendezvous post by General William Henry Harrison.

Orders issued by General William Henry Harrison from " Northwest Army Headquarters, Worthington, Ohio " on October 28, 1812 indicate the commander, like his supply wagons, was using the road north from the capital.

When the war clouds of 1812 began to creep upon Northwest Ohio, General William Henry Harrison ordered the construction of the fort, beginning in February 1813.

Sneedville was named in honor of William Henry Sneed ( 1812 – 1869 ), an attorney from Knoxville who played a key role in the establishment of Hancock County in the 19th century.