WW II PolandView of an undamaged Polish city from the cockpit of a German medium bomber aircraft; likely a Heinkel He 111 P. Oktober 1939. The German invasion began on 1st September 1939; one week after the signing of the Treaty of Non-aggression (Molotov-Ribbentrop Pact) between Germany and the Union of Soviet Socialist Republics (U.S.SR) in Moscow. Poland. Digitally coloured.