September in Military History
The 9/11 attacks, the Battle of Antietam, and the start of the Blitz, September is a month of profound military consequence.
314 events across 30 days
Featured Events in September

September 11
September 11 Terrorist Attacks
2001

September 1
Germany Invades Poland
1939

September 2
Japan Formally Surrenders, End of World War II
1945
September 3
Britain and France Declare War on Germany
Following Germany's invasion of Poland two days earlier and the failure of ultimatums demanding withdrawal, Great Britain and France declared war on Nazi Germany, transforming a regional conflict into a world war. Britain's declaration came at 11:00 AM, France's at 5:00 PM. The British Empire and Commonwealth nations, including India, Australia, New Zealand, and South Africa, followed within days.
September 4
Geronimo Surrenders, End of the Apache Wars
The Apache war leader Geronimo surrendered to Brigadier General Nelson A. Miles at Skeleton Canyon in southeastern Arizona Territory, ending the last major armed conflict between Native Americans and the United States military. Geronimo's band of 38 Chiricahua Apache, including only 16 warriors, had eluded 5,000 U.S. troops and 3,000 Mexican soldiers for over a year.
Every Day in September
Germany Invades Poland
10 events · 1939
Japan Formally Surrenders, End of World War II
10 events · 1945
Britain and France Declare War on Germany
10 events · 1939
Geronimo Surrenders, End of the Apache Wars
10 events · 1886
Battle of the Chesapeake (Battle of the Virginia Capes)
10 events · 1781
Taxis of the Marne, French Counterattack Saves Paris
10 events · 1914
The Blitz Begins, Germany Bombs London
10 events · 1940
Italy Surrenders, Armistice of Cassibile Announced
10 events · 1943
Battle of Salerno, Operation Avalanche
10 events · 1943
Battle of Lake Erie, Perry's Victory
10 events · 1813
September 11 Terrorist Attacks
24 events · 2001
Battle of Saint-Mihiel, First Independent American Offensive
10 events · 1918
Battle of the Plains of Abraham, Fall of Quebec
10 events · 1759
Star-Spangled Banner, Fort McHenry Withstands British Bombardment
10 events · 1814
Battle of Inchon, MacArthur's Masterstroke
10 events · 1950
Battle of Harlem Heights
10 events · 1776
Battle of Antietam, Bloodiest Day in American History
10 events · 1862
United States Air Force Established
10 events · 1947
First Battle of Saratoga (Freeman's Farm)
10 events · 1777
Battle of Chickamauga, "The Rock of Chickamauga"
10 events · 1863
First Flight of the B-29 Superfortress
10 events · 1942
Preliminary Emancipation Proclamation
10 events · 1862
Bonhomme Richard vs. HMS Serapis, "I Have Not Yet Begun to Fight"
10 events · 1779
USS Enterprise (CVN-65) Launched, First Nuclear-Powered Aircraft Carrier
10 events · 1960
Battle of Stamford Bridge
10 events · 1066
Meuse-Argonne Offensive Begins, Largest American Battle in History
10 events · 1918
Tripartite Pact Signed, Axis Alliance Formalized
10 events · 1940
Siege of Yorktown Begins
10 events · 1781
Allies Breach the Hindenburg Line
10 events · 1918
Munich Agreement, "Peace for Our Time"
10 events · 1938
Notable Military Figures Born in September
September 1
Edgar Rice Burroughs
Private
Author of Tarzan and John Carter of Mars who served in the 7th U.S. Cavalry at Fort Grant, Arizona. During World War II, at age 67, he became the oldest American war correspondent in the Pacific theater, covering the Battle of Midway and flying combat missions with bomber crews.
1875–1950
September 1
Siegfried Westphal
General of Cavalry
German Army officer who served as chief of staff to Rommel in North Africa and later to Kesselring and Rundstedt on the Western Front. One of the most capable staff officers of the Wehrmacht, he played a key role in coordinating Axis operations across multiple theaters.
1902–1982
September 2
Lyuh Woon-hyung
Korean independence activist who organized the Committee for the Preparation of Korean Independence in 1945 and briefly led the short-lived People's Republic of Korea. A moderate nationalist, he sought to unify the Korean peninsula before it was divided into Soviet and American zones of occupation.
1886–1947
September 2
Henry Royall
Major General
U.S. Army officer who served as Inspector General during World War I and later as judge advocate. He played a key administrative role in the expansion of the Army during both world wars.
1876–1946
September 3
Alan Ladd
Private
American actor who enlisted in the Army Air Forces during World War II but was medically discharged in 1943. He starred in numerous war films and is best remembered for his role in "Shane" (1953). He used his fame to sell war bonds and support military morale efforts.
1913–1964
September 3
Ferdinand Porsche
Austrian-German automotive engineer who designed the Volkswagen Beetle and, during World War II, the Tiger I and Tiger II heavy tanks, the Elefant tank destroyer, and the Maus super-heavy tank prototype. His tank designs were among the most feared weapons of the war, though many suffered from mechanical unreliability.
1875–1951
September 4
Albert DeSalvo
Former U.S. Army soldier who served in Germany. Although best known for claiming to be the "Boston Strangler," DeSalvo was also a trained military boxer and served as an Army MP. His case raised questions about the psychological effects of military service.
1931–1973
September 4
Henry Ford II
Grandson of Henry Ford who was released from the Navy in 1943 to take over Ford Motor Company, then the nation's third-largest defense contractor. Under his leadership, Ford produced B-24 Liberator bombers at the Willow Run plant at a rate of one per hour, the most impressive feat of wartime mass production.
1917–1987
September 5
Louis XIV
The "Sun King" of France who reigned for 72 years and transformed France into Europe's dominant military power. He fought four major wars, built the palace of Versailles, established a standing army of 400,000, the largest in European history to that point, and created the model of the modern military state.
1638–1715
September 5
Frank Gruber
Lieutenant
American author and screenwriter who served in World War I as a teenager. He wrote extensively about military themes in his westerns and detective fiction, drawing on his service experience for authenticity.
1904–1969
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About September in Military History
September has witnessed 314 significant military events spanning from the American Revolution to the modern era. Each day of September carries its own story of battles, innovations, sacrifices, and turning points that shaped the course of military history.
Our day-by-day coverage includes detailed narratives, historical context, images from military archives, and connections to our broader library of military history articles. Whether you're researching a specific date or browsing for fascinating stories, September has no shortage of compelling military history.