April 11

Mongol forces under Batu Khan defeat King Béla IV of Hungary at the Battle of Mohi.

Mongol forces under Batu Khan, a grandson of Genghis Khan, inflicted a crushing defeat on the army of King Béla IV of Hungary at the Battle of Mohi, opening much of Hungary to Mongol devastation. The Mongols withdrew from Europe the following year following the death of the Great Khan Ögedei, sparing the continent from further immediate conquest.

Franco-Ferrarese forces defeat a Holy League army at the Battle of Ravenna during the War of the League of Cambrai.

Combined French and Ferrarese forces defeated a Holy League army, including Spanish and papal troops, at the bloody Battle of Ravenna during the War of the League of Cambrai, though French commander Gaston de Foix was killed in the fighting. Despite the tactical victory, the heavy French losses and diplomatic pressures ultimately forced France to withdraw from Italy shortly afterward.

William III and Mary II are crowned as joint sovereigns of England, Scotland, and Ireland.

William III of Orange and his wife Mary II, daughter of the deposed King James II, were formally crowned as joint monarchs of England, Scotland, and Ireland following the Glorious Revolution. Their joint reign established important constitutional precedents limiting royal authority and affirming Parliament's role, developments later enshrined in the English Bill of Rights.

William III and Mary II are crowned joint sovereigns of Great Britain.

The coronation followed the Glorious Revolution of 1688, in which the Catholic King James II was deposed and replaced by his Protestant daughter Mary and her Dutch husband William of Orange. Their joint rule was accompanied by the Bill of Rights, which curtailed royal power and cemented the principle of parliamentary sovereignty in English constitutional history.

France and Great Britain sign the Treaty of Utrecht, helping bring an end to the War of the Spanish Succession.

Representatives of France, Great Britain, Spain, and other European powers signed the Treaty of Utrecht, a series of agreements that helped bring an end to the costly War of the Spanish Succession. The treaty significantly reshaped European and colonial territorial boundaries, including British gains in North America, and helped establish a new balance of power on the continent.

France and Great Britain sign the Treaty of Utrecht, bringing an end to the War of the Spanish Succession.

Under the treaty, Britain recognized Philip V as King of Spain while he in turn renounced any claim to the French throne, preventing the union of the two crowns. Britain also gained significant overseas territories, including Gibraltar and Newfoundland, and secured valuable trading rights, marking a major step in its emergence as a leading colonial and naval power.

Johann Sebastian Bach premieres his "St Matthew Passion" at St. Thomas Church in Leipzig.

Johann Sebastian Bach premiered his "St Matthew Passion," an extensive and emotionally powerful musical setting of the Gospel account of Christ's crucifixion, at St. Thomas Church in Leipzig, where Bach served as music director. Largely forgotten after his death, the work was rediscovered and championed by composer Felix Mendelssohn a century later, helping spark a broader revival of interest in Bach's music.

The Battle of the Basque Roads ends in an incomplete British naval victory after Admiral Lord Gambier fails to fully support Captain Lord Cochrane's attack.

Cochrane had led a daring fireship assault that scattered a French fleet sheltering off the French Atlantic coast, but Gambier's caution in committing the main British fleet prevented the attack from becoming a decisive rout. The episode led to a bitter dispute between the two officers, and though Gambier was cleared at a court-martial he had requested, the affair badly damaged Cochrane's standing with the Admiralty.

Luton Town Football Club is founded in Bedfordshire, England.

The club emerged during the rapid growth of organized football across English towns and cities in the late nineteenth century, as the sport professionalized and local clubs formed to compete in an expanding network of leagues. Luton Town went on to become a long-standing fixture of English football, eventually reaching the Premier League more than a century later.

The Stresa Front conference opens between British Prime Minister Ramsay MacDonald, Italian leader Benito Mussolini, and French minister Pierre Laval to condemn German rearmament.

The three powers met in the Italian town of Stresa to present a united front against Adolf Hitler's violations of the Treaty of Versailles, particularly Germany's reintroduction of military conscription. The resulting agreement proved short-lived, as Italy's invasion of Ethiopia later that year fractured the alliance and pushed Mussolini toward closer ties with Nazi Germany instead.

American forces liberate the Buchenwald concentration camp in Germany.

American soldiers liberated the Buchenwald concentration camp near Weimar, Germany, discovering thousands of starving survivors along with horrific evidence of the systematic brutality and mass killing carried out by the Nazi regime. General Dwight Eisenhower personally toured the camp shortly afterward and ordered extensive documentation of the atrocities, believing future generations might otherwise refuse to believe such crimes had occurred.

President Harry Truman relieves General Douglas MacArthur of his command in Korea and Japan after public disagreements over war strategy.

President Harry Truman relieved General Douglas MacArthur of his command in Korea and Japan after MacArthur publicly and repeatedly challenged Truman's more cautious strategy for the Korean War, including MacArthur's calls to expand the conflict into China. The dramatic dismissal of a wildly popular wartime hero underscored the constitutional principle of civilian control over the U.S. military.

The Stone of Scone, upon which Scottish monarchs were traditionally crowned, is found at the site of the altar in Arbroath Abbey.

The stone had been taken from Westminster Abbey months earlier by Scottish nationalist students protesting its removal to England by Edward I centuries before. Its recovery at Arbroath, symbolically the site of Scotland's medieval declaration of independence, renewed public debate over Scottish identity, and the stone was eventually returned to Scotland permanently in 1996.

The United Kingdom agrees to grant Singapore self-rule, a major step toward the end of British colonial control.

The agreement allowed Singapore to elect its own government to manage internal affairs while Britain retained control over defence and foreign policy, a transitional arrangement common across its decolonizing empire. Full self-government followed in 1959, and Singapore went on to become fully independent in 1965 after a brief union with Malaysia.

NASA launches Apollo 13 toward the Moon, a mission that would be aborted after an oxygen tank explosion.

NASA launched Apollo 13 toward the Moon, the third crewed lunar landing mission, but an oxygen tank aboard the spacecraft exploded two days later, forcing mission controllers and the crew into a harrowing improvised effort to bring the astronauts home safely without landing on the Moon. The mission's dramatic, ultimately successful rescue became one of NASA's most celebrated achievements despite failing its original objective.

London Transport launches Silver Jubilee AEC Routemaster buses to mark Queen Elizabeth II's twenty-fifth year on the throne.

The specially liveried buses, finished in silver rather than the traditional red, ran on London routes as part of nationwide celebrations of the Queen's Silver Jubilee. The Routemaster itself, with its open rear platform and distinctive design, had become an enduring symbol of London since its introduction in the 1950s.

Ugandan dictator Idi Amin is deposed as Tanzanian-backed forces capture the capital, Kampala.

Ugandan dictator Idi Amin, whose brutal eight-year rule had resulted in the deaths of hundreds of thousands of Ugandans, fled into exile as Tanzanian troops and Ugandan rebel forces captured the capital, Kampala, ending his regime. Amin spent the remainder of his life in exile, first in Libya and later Saudi Arabia, without ever facing trial for his government's atrocities.

A major riot breaks out in Brixton, south London, resulting in widespread injuries and property damage.

The unrest erupted after years of tension between the local Black community and the Metropolitan Police, exacerbated by aggressive stop-and-search policing under the "sus law." Almost 300 police officers and dozens of civilians were injured over the disturbances, which prompted a government inquiry into policing and race relations that led to significant reforms.

Customs officers in Middlesbrough, England, seize what they believe to be the barrel of a massive artillery gun bound for Iraq.

The seizure exposed "Project Babylon," a covert Iraqi programme, linked to Canadian engineer Gerald Bull, to build an enormous long-range "supergun" capable of firing shells vast distances. The discovery caused an international scandal over British and European companies' roles in supplying components to Saddam Hussein's regime ahead of the Gulf War.

Australia's men's national soccer team defeats American Samoa 31-0, setting a world record for the largest margin of victory in an international match.

Australia's men's national soccer team defeated American Samoa 31-0 in a World Cup qualifying match, setting a world record for the largest victory margin ever recorded in an official international football match. The lopsided result partly reflected American Samoa fielding an unusually young and inexperienced squad, and it later prompted debate about qualifying formats for smaller footballing nations.