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The following events took place on October 20. The list is arranged in chronological order.

Found 38 events. Showing 1 - 30.

• 1548

  The city of Nuestra Señora de La Paz (Our Lady of Peace) is founded by Alonso de Mendoza by appointment of the king of Spain and Holy Roman Emperor, Charles V.
• 1572

  Relief of Goes: Cristóbal de Mondragón, with 3000 soldiers of the Spanish Tercios, relieves the siege of the city.
• 1720

  Caribbean pirate Calico Jack is captured by the Royal Navy.
• 1740

  Maria Theresa takes the throne of Austria. France, Prussia, Bavaria and Saxony refuse to honour the Pragmatic Sanction and the War of the Austrian Succession begins.
• 1781

  The Patent of Toleration, providing limited freedom of worship, is approved in Habsburg Monarchy.
• 1803

  The United States Senate ratifies the Louisiana Purchase.
• 1805

  General Mack’s army surrenders to Napoleon at Ulm after a few skirmishes.
• 1818

  The Convention of 1818 is signed between the United States and the United Kingdom, which settles the Canada–United States border on the 49th parallel for most of its length.
• 1827

  In the Battle of Navarino, a combined Turkish and Egyptian fleet is defeated by British, French, and Russian naval forces in the last significant battle fought with wooden sailing ships.
• 1873

  Yale, Princeton, Columbia, and Rutgers universities draft the first code of American football rules.
• 1883

  Peru and Chile sign the Treaty of Ancón, by which the Tarapacá province is ceded to the latter, bringing an end to Peru’s involvement in the War of the Pacific.
• 1904

  Chile and Bolivia sign the Treaty of Peace and Friendship, delimiting the border between the two countries.
• 1910

  The hull of the RMS Olympic, sister-ship to the ill-fated RMS Titanic, is launched from the Harland and Wolff shipyard in Belfast, Northern Ireland.
• 1935

  The Long March, a mammoth retreat undertaken by the armed forces of the Chinese Communist Party a year prior, ends.
• 1939

  Pope Pius XII publishes his first major encyclical, entitled Summi Pontificatus.
• 1941

  World War II: Thousands of civilians in Kragujevac in German-occupied Serbia are murdered in the Kragujevac massacre.
• 1944

  The Soviet Army and Yugoslav Partisans liberate Belgrade, the capital of Yugoslavia
• 1944

  Liquefied natural gas leaks from storage tanks in Cleveland and then explodes; the explosion and resulting fire level 30 blocks and kill 130.
• 1944

  American general Douglas MacArthur fulfills his promise to return to the Philippines when he commands an Allied assault on the islands, reclaiming them from the Japanese during the Second World War.
• 1946

  Government of the Democratic Republic of Vietnam decides that October 20 is Vietnam Women’s Day.
• 1947

  The House Un-American Activities Committee begins its investigation into Communist infiltration of Hollywood, resulting in a blacklist that prevents some from working in the industry for years.
• 1947

  The United States of America and the Islamic Republic of Pakistan establish diplomatic relations for the first time.
• 1951

  The “Johnny Bright incident” occurs in Stillwater, Oklahoma
• 1952

  Governor Evelyn Baring declares a state of emergency in Kenya and begins arresting hundreds of suspected leaders of the Mau Mau Uprising, including Jomo Kenyatta, the future first President of Kenya.
• 1961

  The Soviet Union performs the first armed test of a submarine-launched ballistic missile, launching an R-13 from a Golf-class submarine.
• 1962

  People’s Republic of China launches simultaneous offensives in Ladakh and across the McMahon Line, igniting the Sino-Indian War.
• 1968

  Former First Lady Jacqueline Kennedy marries Greek shipping tycoon Aristotle Onassis.
• 1970

  Siad Barre declares Somalia a socialist state.
• 1971

  The Nepal Stock Exchange collapses.
• 1973

  “Saturday Night Massacre”: United States President Richard Nixon fires U.S. Attorney General Elliot Richardson and Deputy Attorney General William Ruckelshaus after they refuse to fire Watergate special prosecutor Archibald Cox, who is finally fired by Robert Bork.

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