Wikipedia:WikiProject Military history/News/September 2026/This month in military history
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- 1173 - The widow Stamira sacrifices herself in order to raise the siege of Ancona by the forces of Emperor Frederick Barbarossa.
- 1644 - Battle of Tippermuir, Montrose defeats Elcho's Covenanters, reviving Royalist cause
- 1862 - American Civil War: Battle of Chantilly - Confederate forces attack retreating Union troops in Chantilly, Virginia.
- 1864 - American Civil War: Confederate John Bell Hood evacuates Atlanta, Georgia after a four-month siege by forces under William T. Sherman.
- 1939 - World War II: Germany attacks Poland, beginning the Polish September Campaign and the war in Europe.
- 1951 - The United States, Australia and New Zealand sign a mutual defence pact, called the ANZUS Treaty.
- 2008 - Iraq War: The United States Armed Forces transfers control of Anbar Province to the Iraqi Armed Forces.
- 31 BC - Roman Civil War: Battle of Actium - Off the western coast of Greece, forces of Octavian defeat troops under Mark Antony and Cleopatra.
- 1192 - The Treaty of Jaffa is signed between Richard I of England and Saladin, leading to the end of the Third Crusade.
- 1649 - The Italian city of Castro is completely destroyed by the forces of Pope Innocent X, ending the Wars of Castro.
- 1807 - The Royal Navy bombards Copenhagen with fire bombs and phosphorus rockets to prevent Denmark from surrendering its fleet to Napoleon.
- 1862 - American Civil War: President Abraham Lincoln reluctantly restores Union General George B. McClellan to full command after General John Pope's disastrous defeat at the Battle of Second Bull Run.
- 1870 - Franco-Prussian War: Battle of Sedan - Prussian forces take French Emperor Napoleon III and 100,000 of his soldiers prisoner.
- 1898 - Battle of Omdurman - British and Egyptian troops defeat Sudanese tribesmen and establishing British dominance in the Sudan.
- 1945 - World War II ends: The final official surrender of Japan is accepted aboard the battleship USS Missouri in Tokyo Bay.
- 36 BC - In the battle of Naulochus, Marcus Vipsanius Agrippa, admiral of Octavian, defeats Sextus Pompeius, son of Pompey, thus ending Pompeian resistance to the Second Triumvirate.
- 1260 - The Mamluks defeat the Mongols at the Battle of Ain Jalut in Palestine, marking their first decisive defeat and the point of maximum expansion of the Mongol Empire.
- 1650 - Third English Civil War: Battle of Dunbar.
- 1651 - Third English Civil War: Battle of Worcester - Charles II of England is defeated in the last major battle of the war.
- 1783 - American Revolutionary War: The war ends with the signing of the Treaty of Paris between the United States and the Great Britain.
- 1870 - Franco-Prussian War: The Siege of Metz begins, resulting in a decisive Prussian victory on October 23.
- 1916 - World War I: Leefe Robinson destroys the German airship Schütte-Lanz SL 11 over Cuffley, north of London; the first German airship to be shot down on British soil.
- 1939 - World War II: France, the United Kingdom, New Zealand and Australia declare war on Germany.
- 1943 - World War II: Mainland Italy is invaded by Allied forces.
- 1260 - The Senese Ghibellines, supported by the forces of King Manfred of Sicily, defeat the Florentine Guelphs at Montaperti.
- 1839 - Battle of Kowloon: British vessels open fire on Chinese war junks enforcing a food sales embargo on the British community in China in the first armed conflict of the First Opium War.
- 1886 - American Indian Wars: After almost 30 years of fighting, Apache leader Geronimo surrenders with his last band of warriors to Nelson Miles at Skeleton Canyon in Arizona.
- 1940 - World War II: The USS Greer becomes the first United States ship fired upon by a German submarine in the war, even though the United States is a neutral power. Tension heightens between the two nations as a result.
- 1944 - World War II: The British 11th Armoured Division liberates the Belgian city of Antwerp.
- 1967 - Vietnam War: Operation Swift begins: U.S. Marines launch a search-and-destroy mission in Quảng Nam and Quảng Tín Provinces. The ensuing four-day battle in Que Son Valley kills 114 Americans and 376 North Vietnamese.
- 1590 - Alexander Farnese's army forces Henry IV of France to lift the siege of Paris.
- 1862 - American Civil War: In the Confederacy's first invasion of the North, Robert E. Lee leads 55,000 men of the Army of Northern Virginia across the Potomac River at White's Ford near Leesburg, Virginia, into Maryland.
- 1905 - Russo-Japanese War: In New Hampshire, United States, the Treaty of Portsmouth, a treaty mediated by US President Theodore Roosevelt, is signed by victor Japan and defeated party Russia.
- 1914 - World War I: First Battle of the Marne begins. Northeast of Paris, the French attack and defeat German forces who are advancing on the capital.
- 1937 - Spanish Civil War: The fall of Llanes.
- 1943 - World War II: The 503rd Parachute Infantry Regiment lands at Nazdab in Papua New Guinea.
- 394 - Battle of the Frigidus: The Christian Roman emperor Theodosius I defeats and kills the pagan-tolerant usurper Eugenius and his Frankish magister militum Arbogast.
- 1781 - American Revolutionary War: The Battle of Groton Heights takes place, resulting a British minor victory.
- 1861 - American Civil War: Forces under Union General Ulysses S. Grant bloodlessly capture Paducah, Kentucky, which gives the Union control of the mouth of the Tennessee River.
- 1915 - The first prototype tank is tested for the British Army for the first time.
- 1937 - Spanish Civil War: The start of the Battle of El Mazuco.
- 2007 - Israel executes the air strike Operation Orchard to destroy a nuclear reactor in Syria.
- 2022 - Russo-Ukrainian War: Ukraine begins its Kharkiv counteroffensive, surprising Russian forces and retaking over 3,000 km2 of land
- 1191 - Third Crusade: Battle of Arsuf - Richard I of England defeats Saladin at Arsuf.
- 1706 - War of the Spanish Succession: Siege of Turin ends, leading to the withdrawal of French forces from North Italy.
- 1776 - World's first submarine attack: the American submersible craft Turtle attempts to attach a time bomb to the hull of British Admiral Richard Howe's flagship Eagle in New York Harbor.
- 1812 - Napoleonic Wars: Battle of Borodino - Napoleon defeats the Russian army of Alexander I near the village of Borodino.
- 1940 - World War II: The Blitz - Germany begins to rain bombs on London. This will be the first of 57 consecutive nights of bombing.
- 1965 - Vietnam War: In a follow-up to August's Operation Starlight, United States Marines and South Vietnamese forces initiate Operation Piranha on the Batangan Peninsula.
- AD 70 – After the capture of Herod's Palace the previous day, a Roman army under Titus secures and plunders the city of Jerusalem.
- 1380 - Battle of Kulikovo - Russian forces defeat a mixed army of Tatars and Mongols, stopping their advance.
- 1514 - Battle of Orsha - In one of the biggest battles of the century, Belarusians and Poles defeat the Russian army.
- 1655 - Warsaw falls without resistance to a small force under the command of Charles X Gustav of Sweden during The Deluge, making it the first time the city is captured by a foreign army.
- 1863 - American Civil War: Second Battle of Sabine Pass - On the Texas–Louisiana border at the mouth of the Sabine River, a small Confederate force thwarts a Union invasion of Texas.
- 1923 - Honda Point disaster: Nine US Navy destroyers run aground off the California coast. Seven are lost.
- 1941 - World War II: Siege of Leningrad begins. German forces begin a siege against the Soviet Union's second-largest city, Leningrad. Stalin orders the Volga Germans deported to Siberia.
- 1943 - World War II: United States General Dwight D. Eisenhower publicly announces the Allied armistice with Italy.
- 1945 - Cold War: United States troops arrive to partition the southern part of Korea in response to Soviet troops occupying the northern part of the peninsula a month earlier.
- 1951 - Treaty of San Francisco: In San Francisco, 48 nations sign a peace treaty with Japan in formal recognition of the end of the Pacific War.
- 1000 AD - Battle of Svolder somewhere in the Baltic Sea between Norway and other Scandinavians.
- 1141 - Yelü Dashi, the Liao dynasty general who founded the Qara Khitai, defeats the Seljuq and Kara-Khanid forces at the Battle of Qatwan.
- 1320 - In the Battle of Saint George, the Byzantines under Andronikos Asen ambush and defeat the forces of the Principality of Achaea, securing possession of Arcadia.
- 1493 - Battle of Krbava Field, a decisive defeat of Croats in Croatian struggle against the Ottoman Empire invasion.
- 1513 - James IV of Scotland is defeated and dies in the Battle of Flodden, ending Scotland's involvement in the War of the League of Cambrai.
- 1855 - Crimean War: The Siege of Sevastopol comes to an end when Russian forces abandon the city.
- 1914 - World War I: The creation of the Canadian Automobile Machine Gun Brigade, the first fully mechanized unit in the Canadian Army.
- 1943 - World War II: The Allies land at Salerno in Italy.
- 1547 - The Battle of Pinkie, the last full-scale military confrontation between England and Scotland, resulting in a decisive victory for the forces of Edward VI.
- 1798 - At the Battle of St. George's Caye, British Honduras defeats Spain.
- 1813 - War of 1812: The [[United States|] defeats the British Fleet at the Battle of Lake Erie.
- 1939 - World War II: The submarine HMS Oxley is sunk by mistake by the submarine HMS Triton off the coast of Norway and becomes the Royal Navy's first loss in the Second World War.
- 1942 - World War II: The Allies carry out an amphibious landing at Majunga in north-west Madagascar, to re-launch offensive operations in the Madagascar Campaign.
- 2000 - Operation Barras successfully frees six British soldiers held captive for over two weeks and contributes to the end of the Sierra Leone Civil War.
- 9 - The Battle of the Teutoburg Forest ends: The Roman Empire suffers the greatest defeat of its history and the Rhine is established as the border between the Empire and the Germanic peoples for the next four hundred years.
- 1297 - Battle of Stirling Bridge: Scots led by William Wallace defeat the English.
- 1390 - Lithuanian Civil War: The Teutonic Knights begin a five-week siege of Vilnius.
- 1565 - Ottoman forces retreat from Malta ending the Great Siege of Malta.
- 1649 - Siege of Drogheda ends: Oliver Cromwell's English Parliamentarian troops take the town and massacre its garrison.
- 1777 - American Revolutionary War: Battle of Brandywine - Major British victory in Chester County, Pennsylvania.
- 1914 - World War I: Australia invades German New Guinea, defeating a German contingent at the Battle of Bita Paka.
- 1919 - US Marines invade Honduras.
- 1982 - The international forces that were guaranteeing the safety of Palestinian refugees following Israel's 1982 Invasion of Lebanon leave Beirut. Five days later, several thousand refugees are massacred in the Sabra and Shatila refugee camps by Phalange forces.
- 2001 - The September 11 attacks, a series of coordinated terrorist attacks killing 2,977 people using four aircraft hijacked by 19 members of al-Qaeda. Two aircraft crash into the World Trade Center in New York City, a third crashes into The Pentagon in Arlington County, Virginia, and a fourth into a field near Shanksville, Pennsylvania.
- 490 BC - Battle of Marathon: The Athenians and their Plataean allies defeat the first Persian invasion of Greece.
- 1213 - Albigensian Crusade: Simon de Montfort, 5th Earl of Leicester defeats Peter II of Aragon, the king of Aragon at the Battle of Muret.
- 1229 - An Aragonese–Catalan army under the command of James I of Aragon disembarks at Santa Ponça, Mallorca, with the purpose of conquering the island.
- 1847 - Mexican–American War: The Battle of Chapultepec begins. U.S. Army deserters in the Saint Patrick's Battalion who fought alongside the Mexican army are hanged en masse for treason by the order of General Winfield Scott.
- 1943 - World War II: Benito Mussolini is rescued from house arrest by German commando forces led by Otto Skorzeny.
- 2005 - Israeli–Palestinian conflict: The Israeli disengagement from Gaza is completed, leaving some 2,530 Israeli homes demolished.
- 585 BC - Lucius Tarquinius Priscus, king of Rome, celebrates a triumph for his victories over the Sabines, and the surrender of Collatia.
- 533 - Byzantine Empire forces under Belisarius defeat Gelimer and the Vandals at the Battle of Ad Decimum, near Carthage in North Africa.
- 1645 - Wars of the Three Kingdoms: Scottish Royalists are defeated by Covenanters at the Battle of Philiphaugh.
- 1759 - Seven Years' War: British defeat French near Quebec City in the Battle of the Plains of Abraham.
- 1900 - Philippine–American War: Filipino resistance fighters defeat a larger American column in the Battle of Pulang Lupa.
- 1914 - World War I: South African troops open hostilities in German South West Africa with an assault on the Ramansdrift police station.
- 1944 - World War II: Start of the Battle of Meligalas between the Greek People's Liberation Army (ELAS) and the collaborationist security battalions.
- 919 - Battle of Islandbridge: High King Niall Glúndub is killed while leading an Irish coalition against the Vikings of Uí Ímair, led by King Sitric Cáech.
- 1180 - Genpei War: In the Battle of Ishibashiyama in Japan, the new military commander of the Minamoto clan, Minamoto no Yoritomo, is routed by Ōba Kagechika of the Taira clan.
- 1402 - Battle of Homildon Hill: An invading Scottish army under Murdoch Stewart, Duke of Albany and Archibald, Earl Douglas is decimated by English archers under the command of George, Earl of March and Henry Percy, 1st Earl of Northumberland.
- 1812 - French grenadiers enter Moscow.
- 1829 - Ottoman Empire signs the Treaty of Adrianople with Russia, ending the Russo-Turkish War
- 1847 - Mexican–American War: US Forces under Winfield Scott capture Mexico City.
- 1944 - United States Marines land on the island of Peleliu.
- 994 - Fatimid victory over the Byzantine Empire at the Battle of the Orontes.
- 1812 - The French army under Napoleon reaches the Kremlin in Moscow.
- 1873 - Franco-Prussian War: The last German troops leave France upon completion of payment of indemnity.
- 1894 - First Sino-Japanese War: Japan defeats China in the Battle of Pyongyang, causing the Chinese army to withdraw to the Chinese border with Korea.
- 1914 - World War I: The Battle of Aisne begins between Germany and France.
- 1916 - World War I: Tanks are used for the first time in battle, in the Battle of the Somme.
- 1950 - Korean War: The U.S. X Corps lands at Inchon.
- 1776 - American Revolutionary War: the Battle of Harlem Heights is fought.
- 1941 - World War II: Concerned that Reza Pahlavi the Shah of Iran, was about to align his petroleum-rich country with Germany, the United Kingdom and the USSR occupy Iran and forced him to resign in favour of his son, Mohammad Reza Pahlavi.
- 1176 - The Battle of Myriokephalon is fought.
- 1462 - The Battle of Świecino (or Battle of Żarnowiec) is fought during the Thirteen Years' War.
- 1809 - Peace between Sweden and Russia in the Finnish War. The territory to become Finland is ceded to Russia by the Treaty of Fredrikshamn.
- 1862 - American Civil War: George McClellan halts the northward drive of Robert E. Lee's Confederate army in the single-day Battle of Antietam, the single bloodiest day of the war, and in American history. Over 23,000 Casualties in under twelve hours of combat marks this as a day as a prime example supreme savagry and brutality in warfare.
- 1894 - Battle of Yalu River, the largest naval engagement of the First Sino-Japanese War.
- 1900 - Philippine–American War: Filipinos under Juan Cailles defeat Americans under Colonel Benjamin F. Cheatham at Mabitac.
- 1916 - World War I: Manfred von Richthofen ("The Red Baron"), a flying ace of the German Luftstreitkräfte, won his first aerial combat near Cambrai, France.
- 1944 - World War II: Allied airborne troops parachute into the Netherlands as the "Market" half of Operation Market Garden.
- 323 - Constantine the Great decisively defeats Licinius in the Battle of Chrysopolis, establishing Constantine's sole control over the Roman Empire.
- 1066 - Norwegian king Harald Hardrada lands with Tostig Godwinson at the mouth of the Humber River and begins his invasion of England.
- 1454 - Thirteen Years' War: In the Battle of Chojnice, the Polish army is defeated by the Teutonic knights.
- 1635 - Emperor Ferdinand II declares war on France.
- 1863 - American Civil War: Battle of Chickamauga.
- 1939 - World War II: A German U-boat sinks the British aircraft carrier HMS Courageous.
- 1947 - The United States Air Force is created separate from the United States Army.
- 634 - Siege of Damascus: The Rashidun Arabs under Khalid ibn al-Walid capture Damascus from the Byzantine Empire.
- 1356 - In the Battle of Poitiers, the English defeat the French.
- 1777 - American Revolutionary War: British forces win a victory over the Continental Army in the First Battle of Saratoga.
- 1799 - French Revolutionary Wars: French-Dutch victory against the Russians and British in the Battle of Bergen.
- 1863 - American Civil War: Battle of Chickamauga.
- 1957 - First U.S. underground nuclear bomb test.
- 2023 - Azerbaijan launches a military offensive against the Republic of Artsakh in the Nagorno-Karabakh region; this leads to the flight of the Armenian population.
- 1187 - Saladin begins the Siege of Jerusalem.
- 1854 - Crimean War: British and French]] troops defeat the Russians in the Battle of Alma.
- 1857 - The Indian Rebellion of 1857 ends with the recapture of Delhi by troops loyal to the East India Company.
- 1870 - The Bersaglieri corps enter Rome through the Porta Pia, and complete the unification of Italy.
- 1939 - World War II: A German Messerschmitt Bf 109 is shot down by a Fairey Battle near Aachen. This is the Royal Air Force's first aerial victory of the .
- 1940 - World War II: Genevieve Grotjan completes the decryption of the Japanese Purple code.
- 1435 - The Treaty of Arras is promulgated, causing Burgundy to switch sides in the Hundred Years' War.<ref>{{cite
- 1745 - Battle of Prestonpans: A Hanoverian army under the command of Sir John Cope is defeated, in ten minutes, by the Jacobite forces of Prince Charles Edward Stuart.
- 1860 - Second Opium War: An Anglo-French force defeats Chinese troops in the Battle of Palikao.
- 1896 - British force under Herbert Kitchener takes Dongola in the Sudan.
- 1942 - The Boeing B-29 Superfortress makes its maiden flight.
- 1950 - George Marshall sworn in as the 3rd United States Secretary of Defense.
- AD 66 - Emperor Nero creates the Roman legion I Italica.
- 1236 - The Lithuanians and Semigallians defeat the Livonian Brothers of the Sword in Battle of Šiauliai.
- 1586 - Eighty Years' War: A Spanish force led by the Marquis del Vasto successfully fights its way past a joint English/Dutch ambush in the Battle of Zutphen.
- 1866 - War of the Triple Alliance: Battle of Curupaity.
- 1914 - World War I: A German submarine sinks three British cruisers, killing almost 1,500 sailors.
- 1937 - Spanish Civil War: Peña Blanca is taken; the end of the Battle of El Mazuco.
- 1965 - The Indo-Pakistani War of 1965 between India and Pakistan over Kashmir ends after the United Nations calls for a ceasefire.
- 1338 - The Battle of Arnemuiden, in which a French force defeats the English, is the first naval battle of the Hundred Years' War and the first naval battle in which gunpowder artillery is used.
- 1409 - The Battle of Kherlen is the second significant victory over Ming dynasty China by the Mongols since 1368.
- 1459 - Wars of the Roses:The Battle of Blore Heath, the first major battle of the English Wars of the Roses, is won by the Yorkists.
- 1529 - The Siege of Vienna begins as Suleiman the Magnificent begins his attack on the city.
- 1642 - First English Civil War: The Battle of Powick Bridge, the first engagement between the primary field armies of the Royalists and the Parliamentarians, ended in a Royalist victory.
- 1779 - American Revolutionary War: USS Bonhomme Richard, commanded by John Paul Jones, wins a fight against the British Serapis and Countess of Scarborough off the coast of England.
- 1803 - Second Anglo-Maratha War: The Battle of Assaye is fought between the British East India Company and the Maratha Empire in India.
- 1821 - Greek War of Independence: Tripolitsa is captured by Greek rebels.
- 1918 - World War I: Battle of Haifa takes place in present-day Israel, part of the Ottoman Empire at that time.
- 1568 - Spanish naval forces defeat an English fleet, under the command of John Hawkins, at the Battle of San Juan de Ulúa near Veracruz.
- 1645 - The Battle of Rowton Heath in England is a Parliamentarian victory over a Royalist army commanded in person by King Charles I.
- 1942 - World War II: Franz Halder is dismissed as Chief of the General Staff of the Oberkommando des Heeres (OKH).
- 1996 - The Comprehensive Test Ban Treaty is opened to signatories, and is immediately signed by 71 states.
- 1066 - The Battle of Stamford Bridge marks the end of the Viking era.
- 1396 - Ottoman Emperor Bayezid I defeats a Christian army at the Battle of Nicopolis.
- 1918 - World War I: The end of the Battle of Megiddo, the climax of the British Army's Sinai and Palestine campaign.
- 1944 - World War II: Surviving elements of the British 1st Airborne Division withdraw from Arnhem.
- 1955 - The Royal Jordanian Air Force is founded.
- 715 - Ragenfrid defeats Theudoald at the Battle of Compiègne.
- 1687 - The Parthenon in Athens is partially destroyed after an explosion caused by the bombing from Venetian forces led by Francesco Morosini who were besieging the Ottoman Turks stationed in Athens.
- 1917 - World War I: The Battle of Polygon Wood begins.
- 1918 - World War I: Meuse-Argonne Offensive begins.
- 1944 - World War II: Operation Market Garden fails.
- 1950 - Korean War: United Nations troops recapture Seoul from the North Koreans.
- 1066 - William the Conqueror and his army set sail from the mouth of the Somme river, beginning the Norman conquest of England.
- 1331 - Battle of Płowce between the Kingdom of Poland and the Teutonic Order.
- 1605 - The armies of Sweden are defeated by the Polish–Lithuanian Commonwealth in the Battle of Kircholm.
- 1941 - The SS Patrick Henry is launched, becoming the first of more than 2,700 Liberty ships.
- 1996 - The Battle of Kabul ends in a Taliban victory; an Islamic Emirate of Afghanistan is established.
- 2020 - Second Nagorno-Karabakh War: Azerbaijan launches an offensive against the self-proclaimed Republic of Artsakh in the Nagorno-Karabakh region, inhabited predominantly by ethnic Armenians.
- 48 BC - Pompey disembarks at Pelusium upon arriving in Egypt, whereupon he is assassinated by order of King Ptolemy XIII.
- 351 - Battle of Mursa Major: the Roman Emperor Constantius II defeats the usurper Magnentius.
- 1066 - William the Conqueror invades England: the Norman Conquest begins.
- 1106 - Battle of Tinchebrai - Henry I of England defeats his brother, Robert Curthose.
- 1238 - King James I of Aragon conquers Valencia from the Moors. Shortly thereafter, he proclaims himself king of Valencia.
- 1322 - Louis IV, Holy Roman Emperor defeats Frederick I of Austria in the Battle of Mühldorf.
- 1708 - Peter the Great defeats the Swedes at the Battle of Lesnaya.
- 61 BC - Pompey the Great celebrates his third triumph for victories over the pirates and the end of the Mithridatic Wars on his 45th birthday
- 1364 - Breton War of Succession: English forces defeat French in the Battle of Auray, ending the war.
- 1864 - American Civil War: The Battle of Chaffin's Farm is fought.
- 1918 - World War I: The Hindenburg Line is broken by Allied forces.
- 1941 - World War II: German forces, with the aid of local Ukrainian collaborators, begin the two-day Babi Yar massacre.
- 1990 - The Lockheed YF-22, which would later become the F-22 Raptor, flies for the first time.
- 489 - Ostrogoths under Theoderic the Great defeat the forces of Odoacer for the second time.
- 1342 - Hundred Years' War: Battle of Morlaix in
- 1744 - France and Spain defeat the Kingdom of Sardinia at the Battle of Madonna dell'Olmo.
- 1813 - Battle of Bárbula: Simón Bolívar defeats Santiago Bobadilla.
- 1938 - The League of Nations unanimously outlaws "intentional bombings of civilian populations".
- 1949 - The Berlin Airlift ends.
- 1954 - The U.S. Navy submarine USS Nautilus is commissioned as the world's first nuclear reactor powered vessel.
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