September 11 is the 254th day of the year (255th in leap years) in the Gregorian calendar; 111 days remain until the end of the year.
9 – The Battle of the Teutoburg Forest ends: The Roman Empire suffers the greatest defeat of its history and the Rhine is established as the border between the Empire and the so-called barbarians for the next four hundred years.
1297 – Battle of Stirling Bridge: Scots jointly led by William Wallace and Andrew Moray defeat the English
1541 – Santiago, Chile, is attacked by indigenous warriors, led by Michimalonco, to free eight indigenous chiefs held captive by the Spaniards
1609 – Henry Hudson arrives on Manhattan Island and meets the indigenous people living there.
1649 – Siege of Drogheda ends: Oliver Cromwell's Parliamentarian troops take the town and execute its garrison
1709 – Battle of Malplaquet: Great Britain, Netherlands, and Austria fight against France.
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, Pennsylvania, 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.
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 exfreemason 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 led to his mysterious disappearance.
1830 – Anti-Masonic Party convention; one of the first American political party conventions.
1851 – Christiana Resistance: Escaped slaves led by William Parker fight off and kill a slave owner who, with a federal marshal and an armed party, sought to seize three of his former slaves in Christiana, Pennsylvania.
1857 – The Mountain Meadows massacre: Mormon settlers and Paiutes massacre 120 pioneers at Mountain Meadows, Utah.
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 German New Guinea, 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, a Jewish moshav in Palestine, is settled.
1941 – Construction begins on the Pentagon.
1941 – Charles Lindbergh's Des Moines speech accusing the British, Jews and FDR's administration of conspiring for war with Germany
1943 – World War II: German troops occupy Corsica and Kosovo-Metohija ending the Italian occupation of Corsica.
1944 – World War II: RAF bombing raid on Darmstadt 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 Borneo.
1954 – Hurricane Edna hits New England (United States) 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.
1967 – China's People's Liberation Army (PLA) launched an attack on Indian posts at Nathu La, Sikkim, India, which resulted in military clashes.
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.
1976 – A bomb planted by a Croatian terrorist, is found at New York's Grand Central Terminal; one NYPD officer is killed trying to defuse it.
1989 – Hungary announces that the East German refugees who had been housed in temporary camps were free to leave for West Germany.
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 terrorist attacks killing 2,977 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
2011 – A dedication ceremony is held at the United States National September 11 Memorial on the 10th anniversary of the September 11 attacks in New York City, and the memorial opens to family members
2012 – A total of 315 people are killed in two garment factory fires in Pakistan.