This was the invasion of Poland. Germany and the Soviets were invading Poland that which marked the beginning of World War 2. It started out on September 1 1939, one week after signing the Molotov-Ribbentrop Pact. While the soviet invasion commenced on 17 September following the Molotov-Togo agreement which terminated the Russian and Japanese Hostiles (Nomonhan Incident) in the east in 16 September.The campaign ended on 6th October with Germany and The Soviet Union dividing and even annexing the whole of Poland. After the invasion Poland falled and colapsed between its land hungry neighbors. But, later on in WW2, Poland was victorius with the allies and also taking over Nazi Germany.