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1939

World War II: The Canadian declaration of war on Germany receives royal assent.

World War II: The Canadian declaration of war on Germany receives royal assent.

1814

War of 1812: The climax of the Battle of Plattsburgh, a major United States victory in the war.

War of 1812: The climax of the Battle of Plattsburgh, a major United States victory in the war.

1944

World War II: Finland, the Soviet Union, and the United Kingdom signed the Moscow Armistice to end the Continuation War.

World War II: Finland, the Soviet Union, and the United Kingdom signed the Moscow Armistice to end the Continuation War.

1916

World War I: The Supreme War Command was established to oversee the armed forces of all the Central Powers.

World War I: The Supreme War Command was established to oversee the armed forces of all the Central Powers.

1983

Cold War: Soviet lieutenant colonel Stanislav Petrov averted a potential nuclear war by identifying as a false alarm…

Cold War: Soviet lieutenant colonel Stanislav Petrov averted a potential nuclear war by identifying as a false alarm signals that appeared to indicate an impending U.S. missile attack.

1944

World War II: The Kassel Mission results in the largest loss by a USAAF group on any mission during the war.

World War II: The Kassel Mission results in the largest loss by a USAAF group on any mission during the war.

1911

Italy declares war on the Ottoman Empire, In this war , Italy gains Libya which ends Ottoman rule in North Africa .

Italy declares war on the Ottoman Empire, In this war , Italy gains Libya which ends Ottoman rule in North Africa .

1364

During the Hundred Years' War, Anglo-Breton forces defeat the Franco-Breton army in Brittany, ending the War of the…

During the Hundred Years' War, Anglo-Breton forces defeat the Franco-Breton army in Brittany, ending the War of the Breton Succession.

1942

World War II: USS Grouper torpedoes Lisbon Maru, not knowing that she is carrying British prisoners of war from Hong…

World War II: USS Grouper torpedoes Lisbon Maru, not knowing that she is carrying British prisoners of war from Hong Kong.

1853

The Crimean War begins when the Ottoman Empire declares war on the Russian Empire.

The Crimean War begins when the Ottoman Empire declares war on the Russian Empire.

1602

Eighty Years' War and the Anglo-Spanish War: A fleet of Spanish galleys are defeated by English and Dutch galleons in…

Eighty Years' War and the Anglo-Spanish War: A fleet of Spanish galleys are defeated by English and Dutch galleons in the English Channel.

1940

World War II: The McCollum memo proposes bringing the United States into the war in Europe by provoking the Japanese…

World War II: The McCollum memo proposes bringing the United States into the war in Europe by provoking the Japanese to attack the United States.

1966

Louise Thuliez, French school teacher, resistance fighter during World War I and World War II, and author (born 1881)

Louise Thuliez, French school teacher, resistance fighter during World War I and World War II, and author (born 1881)

1943

World War II: Marshal Pietro Badoglio announces that Italy has officially declared war on Germany.

World War II: Marshal Pietro Badoglio announces that Italy has officially declared war on Germany.

2020

Second Libyan Civil War: The Second Libyan Civil War comes to an end as all parties to the 5+5 Joint Libyan Military…

Second Libyan Civil War: The Second Libyan Civil War comes to an end as all parties to the 5+5 Joint Libyan Military Commission agree to a ceasefire.

1648

The Peace of Westphalia is signed, marking the end of the Thirty Years' War and the Eighty Years' War.

The Peace of Westphalia is signed, marking the end of the Thirty Years' War and the Eighty Years' War.

1944

World War II: The USS Tang under Richard O'Kane (the top American submarine ace of the war) is sunk by the ship's own…

World War II: The USS Tang under Richard O'Kane (the top American submarine ace of the war) is sunk by the ship's own malfunctioning torpedo.

1944

World War II: The final attempt of the Imperial Japanese Navy to win the war climaxes at the Battle of Leyte Gulf.

World War II: The final attempt of the Imperial Japanese Navy to win the war climaxes at the Battle of Leyte Gulf.

1917

World War I: Brazil declares war on the Central Powers.

World War I: Brazil declares war on the Central Powers.

1918

World War I: A new Polish government in western Galicia is established, triggering the Polish–Ukrainian War.

World War I: A new Polish government in western Galicia is established, triggering the Polish–Ukrainian War.