High Quality Content by WIKIPEDIA articles! The history of Poland from 1939 to 1945 encompasses the German invasion of Poland as well as the Soviet invasion of Poland through to the end of World War II. On 1 September 1939, without a formal declaration of war, Germany invaded Poland. Germany`s immediate pretext was the Gleiwitz incident, a provocation staged by the Gestapo claiming that Polish troops had allegedly committed "provocations" along the German-Polish border including house torching, which were all staged by the Germans. Nazi Germany also used issues like the dispute between Germany and Poland over German rights to the Free City of Danzig and the freeing of a passage between East Prussia and the rest of Germany through the Polish Corridor as excuses for the invasion. Pursuant to the Molotov-Ribbentrop Pact, Poland was attacked by the Soviet Union on 17 September 1939. Before the end of the month most of Poland was divided between Germany and the Soviets.