Wrong War

POD- Hitler delays the invasion of Poland until September 20th, 1939, in response to the Anglo-Polish mutual defense treaty. Meanwhile the Soviets invade eastern Poland on September 17th and (in another POD), Polish armed forces engage the Russians. By terms of the bilateral Pact, the UK signed with Poland became obligated to declare war on the Soviet Union, while still at peace with Germany.

Timeline: The Wrong War