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Battle
Battle of Ostrowią Mazowiecką
- 4 September 1920
- Europe
Meanwhile, elsewhere
- 1945 – 1991Cold WarSouth America
- 1929 – 1941Great DepressionSouth Asia
- 1945atomic bombings of Hiroshima and NagasakiEast Asia
- 1915 – 1923Armenian GenocideMiddle East
- 7 December 1941Attack on Pearl HarborNorth America
- 1918 – 19201918–1920 flu pandemic
- 1937 – 1945Second Sino-Japanese WarEast Asia
- 1904 – 1905Russo-Japanese WarEast Asia