European WarMilitary
Germany invades Poland
On 1 September 1.5 million German troops cross the Polish frontier, supported by Stuka dive-bombers and Panzer divisions. Britain and France declare war on 3 September.
The invasion was prepared by the Molotov-Ribbentrop Pact of 23 August, whose secret protocol carved Eastern Europe into German and Soviet spheres. Warsaw fell on 27 September; the Red Army entered eastern Poland on 17 September. Within five weeks the Polish state had ceased to exist, partitioned along the Bug river. The Western Allies, despite their guarantees, launched no serious offensive — the 'Phoney War' had begun.