Invasion of Poland - Wikipedia
https://en.wikipedia.org/wiki/Invasion_of_Poland
The Invasion of Poland, also known as September campaign (Polish: Kampania wrześniowa), 1939 defensive war (Polish: Wojna obronna 1939 roku) and Poland campaign (German: Überfall auf Polen, Polenfeldzug), was an attack on the Second Polish Republic by Nazi Germany and the Soviet Union which marked the beginning of World War II.The German invasion began on 1 September 1939, one week after the ...
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