September 11 is the 254th day of the year in the Gregorian calendar. There are 111 days remaining until the end of the year.
Between the years AD 1900 and 2099, September 11 of the Gregorian calendar is the leap day of the Coptic and Ethiopian calendars.
These leap days occur in the years immediately before those which are leap years in the Julian and Gregorian calendars. In all common years of the Coptic and Ethiopian calendars, September 11 is New Year's Day.
1185 – Isaac II Angelos kills Stephen Hagiochristophorites and then appeals to the people, resulting in the revolt that deposes Andronikos I Komnenos and places Isaac on the throne of the Byzantine Empire.
1226 – The first recorded instance of the Catholic practice of perpetual Eucharistic adoration formally begins in Avignon, France.
1297 – Battle of Stirling Bridge: Scots jointly led by William Wallace and Andrew Moray defeat the English.
1390 – Lithuanian Civil War (1389–92): The Teutonic Knights begin a five-week siege of Vilnius.
1541 – Santiago, Chile, is destroyed by indigenous warriors, led by Michimalonco.
1565 – Ottoman forces retreat from Malta ending the Great Siege of Malta.
1609 – Henry Hudson discovers Manhattan Island and the indigenous people living there.
1649 – Siege of Drogheda ends: Oliver Cromwell's English Parliamentarian troops take the town and execute its garrison.
1683 – Battle of Vienna: Coalition forces, including the famous winged Hussars, led by Polish King John III Sobieski break the siege waged by Ottoman forces.
1697 – Battle of Zenta: a major engagement in the Great Turkish War (1683–1699) and one of the most decisive defeats in Ottoman history.
1708 – Charles XII of Sweden stops his march to conquer Moscow outside Smolensk, marking the turning point in the Great Northern War. The army is defeated nine months later in the Battle of Poltava, and the Swedish Empire ceases to be a major power.
1709 – Battle of Malplaquet: Great Britain, Netherlands and Austria fight against France.
1714 – Siege of Barcelona: Barcelona, capital city of Catalonia, surrenders to Spanish and French Bourbon armies in the War of the Spanish Succession.
1758 – Battle of Saint Cast: France repels British invasion during the Seven Years' War.
1775 – Benedict Arnold's expedition to Quebec leaves Cambridge, Massachusetts.
1776 – British–American peace conference on Staten Island fails to stop nascent American Revolutionary War.
1777 – American Revolutionary War: Battle of Brandywine: The British celebrate a major victory in Chester County, Pennsylvania.
1780 – American Revolutionary War: Sugarloaf Massacre: A small detachment of militia from Northampton County are attacked by Native Americans and Loyalists near Little Nescopeck Creek.
1786 – The beginning of the Annapolis Convention.
1789 – Alexander Hamilton is appointed the first United States Secretary of the Treasury.
1792 – The Hope Diamond is stolen along with other French crown jewels when six men break into the house where they are stored.
1800 – The Maltese National Congress Battalions are disbanded by British Civil Commissioner Alexander Ball.
1802 – France annexes the Kingdom of Piedmont.
1803 – Battle of Delhi, during the Second Anglo-Maratha War, between British troops under General Lake, and Marathas of Scindia's army under General Louis Bourquin.
1813 – War of 1812: British troops arrive in Mount Vernon and prepare to march to and invade Washington, D.C..
1814 – War of 1812: The climax of the Battle of Plattsburgh, a major United States victory in the war.
1826 – Captain William Morgan, an ex-freemason is arrested in Batavia, New York for debt after declaring that he would publish The Mysteries of Free Masonry, a book against Freemasonry. This sets into motion the events that lead to his mysterious disappearance.
1829 – Surrender of the expedition led by Isidro Barradas at Tampico, sent by the Spanish crown in order to retake Mexico. This was the consummation of Mexico's campaign for independence.
1830– Anti-Masonic Party convention; one of the first American political party conventions.
1836 – The Riograndense Republic is proclaimed by rebels after defeating Empire of Brazil's troops in the Battle of Seival, during the Ragamuffin War.
1851 – Christiana Resistance: Escaped slaves stand against their former owner in armed resistance in Christiana, Pennsylvania, creating a rallying cry for the abolitionist movement.
1852 – Outbreak of Revolution of September 11 resulting in the State of Buenos Aires declaring independence as a Republic.
1857 – The Mountain Meadows massacre: Mormon settlers and Paiutes massacre 120 pioneers at Mountain Meadows, Utah.
1897 – After months of pursuit, generals of Menelik II of Ethiopia capture Gaki Sherocho, the last king of Kaffa, bringing an end to that ancient kingdom.
1903 – The first race at the Milwaukee Mile in West Allis, Wisconsin is held. It is the oldest major speedway in the world.
1905 – The Ninth Avenue derailment occurs in New York City, killing 13.
1914 – World War I: Australia invades New Britain, defeating a German contingent at the Battle of Bita Paka.
1916 – The Quebec Bridge's central span collapses, killing 11 men. The bridge previously collapsed completely on August 29, 1907.
1919 – United States Marine Corps invades Honduras.
1921 – Nahalal, the first moshav in Palestine, is settled as part of a Zionist plan of creating a Jewish state, later to be Israel.
1922 – The Treaty of Kars is ratified in Yerevan, Armenia.
1922 – The Sun News-Pictorial is founded in Melbourne, Australia.
1941 – Charles Lindbergh's Des Moines Speech accusing the British, Jews and FDR's administration of pressing for war with Germany.
1943 – World War II: German troops occupy Corsica and Kosovo-Metohija ending the Italian occupation of Corsica.
1943 – World War II: Start of the Nazi liquidation of the Minsk and Lida ghettos.
1944 – World War II: The Western Allied invasion of Germany begins near the city of Aachen.
1944 – World War II: RAF bombing raid on Darmstadt and the following firestorm kill 11,500.
1945 – World War II: Australian 9th Division forces liberate the Japanese-run Batu Lintang camp, a POW and civilian internment camp on the island of Borneo.
1950 – Korean War: President Harry S. Truman approved military operations north of the 38th parallel.
1954 – Hurricane Edna hits New England as a Category 2 hurricane, causing significant damage and 29 deaths.
1961 – Hurricane Carla strikes the Texas coast as a Category 4 hurricane, the second strongest storm ever to hit the state.
1965 – Indo-Pakistani War: The Indian Army captures the town of Burki, just southeast of Lahore.
1968 – Air France Flight 1611 crashes off Nice, France, killing 89 passengers and six crew.
1970 – The Dawson's Field hijackers release 88 of their hostages. The remaining hostages, mostly Jews and Israeli citizens, are held until September 25.
1971 – The Egyptian Constitution becomes official.
1972 – The San Francisco Bay Area Rapid Transit system begins passenger service.
1973 – A coup in Chile headed by General Augusto Pinochet topples the democratically elected president Salvador Allende. Pinochet exercises dictatorial power until ousted in a referendum in 1988, staying in power until 1990.
1974 – Eastern Air Lines Flight 212 crashes in Charlotte, North Carolina, killing 69 passengers and two crew.
1976 – A bomb planted by a Croatian terrorist, Zvonko Bušić, is found at New York's Grand Central Terminal; one NYPD officer is killed trying to defuse it.
1978 – Janet Parker, a British medical photographer, became the last recorded person to die from smallpox. In light of this incident, all known stocks of smallpox were destroyed or transferred to one of two Biosafety level 4, WHO reference laboratories for smallpox.
1980 – Voters approve a new Constitution of Chile, later amended after the departure of President Pinochet.
1982 – The international forces that were guaranteeing the safety of Palestinian refugees following Israel's 1982 Invasion of Lebanon leave Beirut. Five days later, several thousand refugees are massacred in the Sabra and Shatila refugee camps by Phalange forces.
1985 – Pete Rose breaks Ty Cobb's baseball record for most career hits with his 4,192nd hit.
1989 – Hungary announces that the East German refugees who had been housed in temporary camps were free to leave for West Germany.
1992 – Hurricane Iniki, one of the most damaging hurricanes in United States history, devastates the Hawaiian islands of Kauai and Oahu.
1997 – NASA's Mars Global Surveyor reaches Mars.
1997 – After a nationwide referendum, Scotland votes to establish a devolved parliament within the United Kingdom.
2001 – The September 11 attacks, a series of coordinated suicide attacks killing 2,996 people using four aircraft hijacked by 19 members of al-Qaeda. Two aircraft crash into the World Trade Center in New York City, a third crashes into The Pentagon in Arlington County, Virginia, and a fourth into a field near Shanksville, Pennsylvania.
2005 – Israel had completed the disengagement from Gaza plan.
2007 – Russia tests the largest conventional weapon ever, the Father of All Bombs.
2008 – A major Channel Tunnel fire breaks out on a freight train, resulting in the closure of part of the tunnel for six months.
2011 – The National September 11 Memorial & Museum opens on the 10th anniversary of the September 11 attacks.
2012 – A total of 315 people are killed in two garment factory fires in Pakistan.
2012 – The U.S. embassy in Benghazi, Libya is attacked, resulting in four deaths.
2015 – A crane collapses onto the Masjid al-Haram mosque in Saudi Arabia, killing 111 people and injuring 394 others.
