Who declared war on Poland which started World War Two?
Under Adolf Hitler, Germany declared war on Poland in September of 1939. With Polish forces concentrating on the Nazi blitzkrieg on its western border, Stalin, as per the secret part of the German-Soviet Non-Aggression Pact occupied Eastern Poland with almost without a fight. Stalin felt the need however, to execute approximately 15,000 Polish army officers and other military soldiers in the forests of eastern Poland. The Nazi invasion ended with Poland's surrender by the end of the month. As an aside, military historians call the Soviet occupation of Poland as an invasion.As an excuse to invade Poland, Hitler claimed that Poles violated the border with Germany and also committed crimes on German soil. This was not true.