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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
- July 28, 1914 - World War I: The conflict begins when Austria-Hungary declares war on Serbia
- August 28, 1914 - World War I: The Royal Navy wins the Battle of Heligoland Bight.
- November 1, 1914 - World War I: The German navy wins the Battle of Coronel.
- December 25, 1914 - World War I: The Christmas Truce begins along parts of the Western Front
- 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
- November 7, 1917 - Russian Revolution: The Bolsheviks overthrow the Provisional Government, beginning the Russian Civil War
- June 1-28, 1918 - World War I: US Marines win the Battle of Belleau Wood
- 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
- September 6-22, 1937 - Spanish Civil War: Republican forces are defeated at the Battle of El Mazuco
- 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
1940s
- 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 withdraw across the Channel.
- 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
- 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
- December 7, 1941 - World War II: Japanese aircraft attack the US Pacific Fleet at Pearl Harbor bringing the United States into the war
- May 4-8, 1942 - World War II: US forces turn back the Japanese advance against Port Moresby at the Battle of the Coral Sea. Fought entirely by aircraft, it was first naval battle in which the opposing ships never sighted each other.
- June 4-7, 1942 - World War II: The US Pacific Fleet defeats the Japanese at the Battle of Midway, turning the tide in the Pacific
- August 7, 1942 - World War II: Allied forces go on the offensive in the Pacific by landing on Guadalcanal
- October 23-November 4, 1942 - World War II: British forces under General Bernard Montgomery begin the Second Battle of El Alamein
- November 8-10, 1942 - World War II: American forces land in North Africa as part of Operation Torch
- July 9, 1943 - World War II: Allied forces begin Operation Husky and invade Sicily
- September 3-9, 1943 - World War II: American and British forces land in Italy
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