The Invasion of Poland, also known as the September Campaign or 1939 Defensive War (Polish: Kampania wrześniowa or Wojna obronna 1939 roku) in Poland and the Poland Campaign (German: Polenfeldzug) in Germany, was an invasion of Poland by Nazi Germany, the Soviet Union, and a small Slovak contingent that marked the start of World War II. The invasion began on 1 September 1939, one week after the signing of the Molotov–Ribbentrop Pact, and ended 6 ...
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The Invasion of Poland, also known as the September Campaign or 1939 Defensive War (Polish: Kampania wrześniowa or Wojna obronna 1939 roku) in Poland and the Poland Campaign (German: Polenfeldzug) in Germany, was an invasion of Poland by Nazi Germany, the Soviet Union, and a small Slovak contingent that marked the start of World War II. The invasion began on 1 September 1939, one week after the signing of the Molotov–Ribbentrop Pact, and ended 6 October 1939 with Germany and the Soviet Union dividing and annexing the whole of Poland.
The day after the Gleiwitz incident, German forces invaded Poland from the north, south, and west. As the Germans advanced, Polish forces withdrew from their forward bases of operation close to the Polish-German border to more established lines of defence to the east. After the mid-September Polish defeat in the Battle of the Bzura, the Germans gained an undisputed advantage. Polish forces then withdrew to the southeast where they prepared for a long...
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