On 17 September 1939, following German invasion of western Poland in accordance with the secret protocol of Molotov–Ribbentrop Pact, Soviet forces invaded eastern Poland. As the bulk of Polish Army was concentrated in the west fighting Nazi Germany, the Red Army met with limited resistance and their troops quickly moved westward, invading the Voivodeship’s area with considerable ease. They met with the invading Germans along the Curzon Line and held a joint victory parade.