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1900s Military History Timeline

1901-present

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1900s Military History Timeline

US Marines fight the Battle of Belleau Wood

Photograph Source: Public Domain

Timeline Home | to 1000 | 1001-1200 | 1201-1400 | 1401-1600 | 1601-1800 | 1801-1900

1900s

 
  • September 7, 1901 - Boxer Rebellion ends in China
  • May 31, 1902 - Second Boer War: Fighting ends with the Treaty of Vereeniging
  • February 8, 1904 - Russo-Japanese War: Fighting begins when the Japanese attack the Russian fleet at Port Arthur
  • January 2, 1905 - Russo-Japanese War: Port Arthur Surrenders
  • September 5, 1905 - Russo-Japanese War: The Treaty of Portsmouth ends the conflict

    1910s

  • April 21-November 23, 1914 - Mexican Revolution: American forces land and occupy Vera Cruz
  • July 28, 1914 - World War I: The conflict begins when Austria-Hungary declares war on Serbia
  • August 23, 1914 - World War I: British forces join the fray at the Battle of Mons
  • August 23-31, 1914 - World War I: The Germans win a stunning victory at the Battle of Tannenberg
  • August 28, 1914 - World War I: The Royal Navy wins the Battle of Heligoland Bight.
  • October 19-November 22, 1914 - World War I: Allied forces hold at the First Battle of Ypres
  • November 1, 1914 - World War I: Vice Admiral Maximilian von Spee's German East Asia Squadron wins the Battle of Coronel.
  • December 16, 1914 - World War I: German warships raid Scarborough, Hartlepool, and Whitby
  • December 25, 1914 - World War I: The Christmas Truce begins along parts of the Western Front
  • January 24, 1915 - World War I: The Royal Navy wins the Battle of Dogger Bank
  • April 22-May 25, 1915 - World War I: Allied and German forces fight the Second Battle of Ypres
  • September 25-October 14 - World War I: British forces take heavy losses during the Battle of Loos
  • December 23, 1916 - World War I: British Commonwealth forces win the Battle of Magdhaba in the Sinai Desert
  • March 9, 1916 - Mexican Revolution: The forces of Pancho Villa raid across the border and burn Columbus, NM
  • October 31-November 7, 1917 - World War I: General Sir Edmund Allenby wins the Third Battle of Gaza
  • April 6, 1917 - World War I: The United States enters the war
  • June 7, 1917 - World War I: General John J. Pershing arrives in England to take command of US forces in Europe
  • October 24-November 19, 1917 - World War I: Italian troops are routed at the Battle of Caporetto
  • November 7, 1917 - Russian Revolution: The Bolsheviks overthrow the Provisional Government, beginning the Russian Civil War
  • January 8, 1918 - World War I: President Woodrow Wilson outlines his Fourteen Points to Congress
  • June 1-28, 1918 - World War I: US Marines win the Battle of Belleau Wood
  • September 19-October 1, 1918 - World War I: British forces crush the Ottomans at the Battle of Megiddo
  • November 11, 1918 - World War I: An armistice is concluded ending World War I in a victory for the Allies.
  • June 28, 1919 - World War I: The Treaty of Versailles officially ends the war.

    1920s

  • June 1923 - Russian Civil War: Fighting ends with the Red capture of Vladivostok and the collapse of the Provisional Priamur Government
  • April 12, 1927 - Chinese Civil War: Fighting begins between the Kuomintang and Chinese Communist Party

    1930s

  • October 1934 - Chinese Civil War: The Long March retreat begins with Chinese Communists marching approx. 8,000 miles over 370 days
  • October 3, 1935 - Second Italo-Abyssinian War: The conflict begins when Italian troops invade Ethiopia
  • May 7, 1936 - Second Italo-Abyssinian War: Fighting ends with the capture of Addis Ababa and the Italian annexation of the country
  • July 17, 1936 - Spanish Civil War: The conflict begins following an attempted coup d'état by Nationalist forces
  • April 26, 1937 - Spanish Civil War: The Condor Legion bombs Guernica
  • September 6-22, 1937 - Spanish Civil War: Republican forces are defeated at the Battle of El Mazuco
  • September 29/30, 1938 - World War II: The Munich Agreement cedes the Sudetenland to Nazi Germany
  • April 1, 1939 - Spanish Civil War: Nationalist forces crush the final Republican resistance ending the war.
  • September 1, 1939 - World War II: Nazi Germany invades Poland beginning World War II
  • November 30, 1939 - Winter War: Fighting between the Soviet Union and Finland begins when Russian troops cross the border following the faked shelling of Mainila
  • December 13, 1939 - World War II: British and German naval forces fight the Battle of the River Plate

    1940s

  • February 16, 1940 - World War II: British and German forces violated Norwegian neutrality in the Altmark Incident
  • March 12, 1940 - Winter War: The Moscow Peace Treaty ends the war in the Soviet's favor
  • June 22, 1940 - World War II: After a six-week campaign, Germany defeats France and forces the British to evacuate from Dunkirk
  • July 3, 1940 - World War II: The Royal Navy attacks Mers el Kebir
  • July 10-October 31, 1940 - World War II: The Royal Air Force wins the Battle of Britain
  • September 17, 1940 - World War II: Operation Sea Lion, the German invasion of Britain, is indefinitely postponed
  • November 11/12, 1940 - World War II: In a daring nighttime raid, British aircraft strike the Italian fleet at the Battle of Taranto
  • December 8, 1940 - World War II: British forces in Egypt launch Operation Compass which sweeps across the desert driving the Italians deep into Libya
  • March 11, 1941 - World War II: Pres. Franklin Roosevelt signs the Lend-Lease Act
  • March 27-29, 1941 - World War II: British naval forces defeat the Italians at the Battle of Cape Matapan
  • April 6-30, 1941 - World War II: German forces win the Battle of Greece
  • May 24, 1941 - World War II: HMS Hood is sunk at the Battle of the Denmark Strait
  • May 27, 1941 - World War II: Following aerial attacks from HMS Ark Royal and fire from British battleships, the German battleship Bismarck is sunk in the North Atlantic
  • June 22, 1941 - World War II: German forces invade the Soviet Union opening the Eastern Front
  • September 8, 1941-January 27, 1944 - World War II: German forces conduct the Siege of Leningrad but fail to capture the city.
  • October 2, 1941-January 7, 1942 - World War II: The Soviets win the Battle of Moscow
  • December 7, 1941 - World War II: Japanese aircraft attack the US Pacific Fleet at Pearl Harbor bringing the United States into the war
  • December 8-23, 1941 - World War II: Japan wins the Battle of Wake Island
  • December 8-25, 1941 - World War II: The British are defeated at the Battle of Hong Kong
  • December 10, 1941 - World War II: HMS Prince of Wales and HMS Repulse are sunk by Japanese aircraft

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