 The German invasion of Poland was made possible by the August 1939 Molotov–Ribbentrop Pact, in which Nazi Germany and the Soviet Union divided Poland's territories between them, while the latter power granted generous economic aid to Hitler.Jeschonnek had briefed Göring on the planned invasion on 25 April 1939.2,152 combat aircraft were assembled in "Luftflotte" 1 and 4.