Wikipedia:Selected anniversaries/September 20

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 * 1066 – Harald III of Norway and his English ally Tostig Godwinson defeated the northern earls Edwin and Morcar at the Battle of Fulford near York.
 * 1260 – The second of two major uprisings by the Old Prussians, a Baltic tribe, began against the Teutonic Knights.
 * 1643 – First English Civil War: The First Battle of Newbury was fought in Berkshire; Parliamentarian forces were allowed to pass Royalist troops to retreat the next morning.
 * 1697 – The first of a series of treaties comprising the Peace of Ryswick was signed between France and the Grand Alliance, ending the Nine Years' War.
 * 1870 – The Bersaglieri entered Rome through the Porta Pia, ending the temporal power of the Pope and completing the unification of Italy.
 * 1920 – Irish War of Independence: British auxiliary police officers known as Black and Tans went on a rampage in Balbriggan, burning more than fifty homes and businesses and killing two people.
 * 1943 – World War II: Australian troops led by Gordon Grimsley King defeated Imperial Japanese forces at the Battle of Kaiapit in New Guinea.
 * 1944 – Second World War: Allied forces captured San Marino from the German Army.
 * 1967 – Sweden, Norway, and Denmark submit the Greek case alleging human rights violations by the Greek junta.
 * 1971 – Hurricane Irene (satellite image pictured) moved into the Pacific Ocean from the Atlantic, making it the first actively tracked tropical cyclone to do so.
 * 1973 – Billie Jean King defeated Bobby Riggs in straight sets at the Astrodome in Houston, Texas, in an internationally televised tennis match dubbed the "Battle of the Sexes".
 * 1977 – A series of celestial phenomena of disputed nature was observed in the western Soviet Union, Finland and Denmark.
 * 1984 – The Cosby Show, which became one of three U.S. television shows to have the highest ratings five years in a row, premiered with its pilot episode.
 * 1988 – British prime minister Margaret Thatcher gave a landmark speech at the Belfry of Bruges, Belgium, against federalism in the European Economic Community.
 * 2000 – The Real Irish Republican Army carried out a rocket-launcher attack on the MI6 headquarters in London, with no casualties and minimal damage recorded.
 * 2008 – An explosive-laden truck detonated in front of the Marriott hotel in Islamabad, Pakistan, killing 54 people and injuring 266 others.
 * 2011 – The United States military ended its "don't ask, don't tell" policy, consequently allowing gay and lesbian people to serve openly.
 * Born/died this day: | Gozbald |d|855| Maurice Benyovszky |b|1746| Herbert Putnam |b|1861|John Patteson |d|1871| Jacob Grimm |d|1863| George Robey |d|1869| Enrico Mizzi |b|1885| Éva Gauthier |b|1885| Dennis Viollet |b|1933| Rose Francine Rogombé |b|1942| Masashi Hamauzu |b|1971|  Erich Hartmann |d|1993