Polish Crisis, 1938-1939 By Jueun 1939 Anti-fascist ally Feb 1, 1939 France, UK military alliance Mar 31, 1939 Britain and France guaranteed Polish border Apr 28, 1939 Withdrew: Polish-German Non-Aggression Pact May 22, 1939 Pact of Steel Jun 15, 1939 Case White Hitler ordered Army to be prepared for invasion Aug 21, 1939 Mobilisation Aug 23, 1939 Nazi-Soviet Pact Aug 25, 1939 Invasion delayed Period: Aug 25, 1939 to Aug 26, 1939 Preventing War negotiation rejected Aug 28, 1939 Britain warned to Germany Aug 29, 1939 German'sDiplomatic gesture Aug 31, 1939 Poland Sent Ambassador Sep 1, 1939 Germany declared war on Poland Sep 2, 1939 Suggested Five-Power Conference Sep 3, 1939 France Britian declared war on Germany