| 11 September 1297 | Scotland, England [Anglo–Scottish Wars 1296–1371)] | The Scottish nationalist William Wallace defeats the English forces, under Earl Warrene, at Stirling Bridge, Scotland. |
| 11 September 1611 | France [births and deaths] | Henri de la Tour d'Auvergne, Vicomte de Turenne, French military leader, marshal of France 1643–68, born in Sedan, France (–1675). |
| 11 September 1697 | Ottoman Empire, Hungary [Habsburg–Ottoman Wars (1525–1718)] | Austrian forces under Prince Eugène of Savoy defeat an Ottoman army under Elmas Mehmed Pasha at Zenta, effectively ending the Ottoman sultan Mustafa II's campaign to recover Hungary. Ottoman losses in the battle amount to nearly 30,000 men. |
| 11 September 1830 | Ecuador, Colombia [decolonization] | Ecuador is recognized as an independent republic and granted a constitution by Colombia, under which it is to be part of the Confederation of Colombia. |
| 11 September 1855 | UK, France, Russian Empire [Crimean War (1854–56)] | British and French forces enter the Crimean city of Sevastopol after the besieged Russians within capitulate. |
| 11 September 1860 | Sardinia-Piedmont, Papal States, Italy [political events] | King Victor Emmanuel II of Sardinia-Piedmont invades the Papal States (which he intends to annex as part of a unified Italy under his sovereignty), after the rising in favour of union with Italy there on 8 September. |
| 11 September 1862 | USA [births and deaths] | O Henry (pen-name of William Sydney Porter), US short-story writer and novelist, born in Greensboro, North Carolina (–1910). |
| 11 September 1885 | England [births and deaths] | D(avid) H(erbert) Lawrence, English poet and novelist, author of the controversial Lady Chatterley's Lover, born in Eastwood, Nottinghamshire, England (–1930). |
| 11 September 1915 | United Kingdom [companies and organizations] | The first Women's Institute is set up, in Anglesey, Wales. |
| 11 September 1952 | Eritrea, Ethiopia [political events] | The United Nations (UN) settlement devised for the former Italian colony of Eritrea (that is, a federation with Ethiopia) is ratified by Emperor Haile Selassie of Ethiopia. Eritrea is to have autonomy in domestic affairs. |
| 11 September 1974–21 March 1983 | USA [television] | Little House on the Prairie, a popular television drama based on the classic series of books by Laura Ingalls Wilder, starts on US television. It chronicles the Ingalls family's struggles in the American West in the 1870s. |
| 11 September 1995 | Bosnia-Herzegovina [wars] | Bosnian government forces launch an offensive in western and central Bosnia-Herzegovina, which reduces Serb-controlled territory from 70% to 50%. |
| 11 September 1998 | Russia [administration] | Russian president Boris Yeltsin names foreign minister Yevgeny M Primakov as his compromise candidate for the position of prime minister, after the Duma (parliament) repeatedly rejects his first choice, Viktor Chernomyrdin. |
| 11 September 2001 | USA [terrorism] | In the world's worst-ever terrorist atrocity, Islamic extremists launch suicide attacks on landmarks in the USA using hijacked civil airliners. Two aircraft are flown into the twin towers of New York's World Trade Center, which subsequently collapse, and another hits the Pentagon (defence department) in Washington, DC. A fourth jet crashes in Pennsylvania before reaching any specific target. Around 3,000 people are thought to have been killed in the attacks and ensuing devastation. |
| 11–30 September 2001 | [terrorism] | The US government calls the 11 September terrorist attacks on New York and Washington, DC, an act of war and pledges military retaliation against known terrorist networks and their state sponsors. With its allies' backing, US forces begin to concentrate around Afghanistan where the chief suspect, Osama bin Laden and his al Qaeda organization, are thought to enjoy the protection of the hard-line Islamic Taliban regime. |
