Wikipedia:Selected anniversaries/April 11

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 * 1241 – Mongol invasion of Europe: Mongol forces led by Batu Khan and Subutai defeated the army of King Béla IV at the Battle of Mohi near the river Sajó, a key victory in their first invasion of Hungary.
 * 1544 – Italian War of 1542–1546: French and Spanish forces fought a massive pitched battle in the Piedmont region of Italy.
 * 1713 – The main treaties of the Peace of Utrecht were signed in Utrecht in the Dutch Republic, helping to end the War of the Spanish Succession.
 * 1814 – The Treaty of Fontainebleau was signed, ending the War of the Sixth Coalition and forcing Napoleon to abdicate as ruler of France and sending him into exile on Elba.
 * 1888 – The Concertgebouw in Amsterdam, considered one of the world's finest concert halls, was inaugurated.
 * 1908 – Blücher, the last armored cruiser built by the Imperial German Navy, was launched.
 * 1913 – The cricket pavilion at the Nevill Ground was destroyed in an arson attack (damage pictured) that was attributed to militant suffragettes as part of a country-wide campaign co-ordinated by the Women's Social and Political Union.
 * 1919 – Paris Peace Conference: Woodrow Wilson overturns Japan's Racial Equality Proposal, stating that unanimous support was required.
 * 1921 – Emir Abdullah established the first centralised government in the recently created British protectorate of Transjordan.
 * 1963 – Pope John XXIII issued Pacem in terris, the first papal encyclical addressed to "all men of good will" rather than only to Catholics.
 * 1968 – Rudi Dutschke, the most prominent leader of the German student movement, survived an assassination attempt, which led to the largest protests to that date in Germany.
 * 1973 – On the Art of the Cinema, a treatise on film propaganda in support of the ruling Workers' Party of Korea written by the future North Korean leader Kim Jong Il, was published.
 * 1979 – Uganda–Tanzania War: The allied forces of Tanzania and the Uganda National Liberation Front captured the capital Kampala, deposing Ugandan president Idi Amin.
 * 1993 – Prisoners at the Southern Ohio Correctional Facility near Lucasville, Ohio, rioted and took over the prison for 11 days, resulting in the deaths of one officer and nine inmates.
 * 1996 – While attempting to set a record as the youngest person to pilot an airplane across the United States, the aircraft flown by seven-year-old Jessica Dubroff crashed in Cheyenne, Wyoming, killing her and two others.
 * 2002 – In a coup attempt, members of the Venezuelan military detained President Hugo Chávez and demanded his resignation.
 * 2011 – A bomb exploded at the central Oktyabrskaya station of the Minsk Metro in Belarus, killing 15 people and injuring more than 200.
 * 2017 – The tour bus of the German football team Borussia Dortmund was attacked with roadside bombs in Dortmund, killing a police officer and injuring one of the team's players.
 * 2023 – A Myanmar Air Force airstrike killed at least 100 villagers in Pazigyi.
 * Born/died:| Anawrahta |d|1077| | Stephen IV of Hungary |d|1165| Ramadan ibn Alauddin |d|1349| Edward Wightman |d|1612| Christopher Smart |b|1722| Edward Everett |b|1794| Ferdinand Lassalle |b|1825| John Douglas (English architect) |b|1830| Arthur Shrewsbury |b|1856| Charles Evans Hughes |b|1862| Joseph Merrick |d|1890| Percy Lavon Julian |b|1899| Percy Lavon Julian |b|1899| Bunny Ahearne |d|1985| Kurt Vonnegut |d|2007| Muhammad Kamaruzzaman |d|2015

April 11


 * 1689 – William III and Mary II (both pictured) were crowned joint sovereigns of England in a ceremony at Westminster Abbey.
 * 1809 – Napoleonic Wars: A hastily assembled Royal Navy fleet launched an assault against the main strength of the French Atlantic Fleet; an incomplete victory led to political turmoil in Britain.
 * 1951 – U.S. president Harry S. Truman relieved General of the Army Douglas MacArthur of his commands for making public statements about the Korean War that contradicted the administration's policies.
 * 2001 – In a FIFA World Cup qualifying match, Australia defeated American Samoa 31–0, the largest margin of victory recorded in international football.