September 1st, 1939. Germany invades Poland in the early morning hours. The Germans employ highly mobile massed tank formations, closely supported by mobile artillery and their airforce - the Luftwaffe. The world would come to know this warfare as the “Blitzkrieg”. As the Polish forces are being driven back, they are ordered to mass together near the Romanian border, where they will try to hold out until the Allies invade Germany from the West.