The day Germany invaded Poland in 1939
The day Germany invaded Poland in 1939 is held on September 1. Triggering World War II. This event in the first decade of the month September is annual. 
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The invasion of Poland (1 September – 6 October 1939) was a joint attack on the Republic of Poland by Nazi Germany, the Slovak Republic, and the Soviet Union; which marked the beginning of World War II.
The German invasion began on 1 September 1939, one week after the signing of the Molotov–Ribbentrop Pact between Germany and the Soviet Union, and one day after the Supreme Soviet of the Soviet Union had approved the pact. The Soviets invaded Poland on 17 September. The campaign ended on 6 October with Germany and the Soviet Union dividing and annexing the whole of Poland under the terms of the German–Soviet Frontier Treaty. The invasion is also known in Poland as the September campaign (Polish: kampania wrześniowa) or 1939 defensive war (Polish: wojna obronna 1939 roku) and known in Germany as the Poland campaign (German: Überfall auf Polen, Polenfeldzug).
Similar holidays and events, festivals and interesting facts
Day of Solidarity and Freedom in Poland on August 31 (It commemorates the August Agreement of 1980);
International Solidarity Day on August 31
Veteran's Day in Poland on September 1
Nativity of the Virgin Mary on September 8
Sybirak's Day in Poland on September 17
Customs Service Day in Poland on September 21
Polish Underground State's Day on September 27
European Researchers' Night on September 27