invaded western Poland Free City of Danzig Polish Corridor Britain and France declared war Germany de Britain France
On 1 September 1939, Germany invaded western Poland under the pretext of having been denied claims to the Free City of Danzig and the right to extraterritorial roads across the Polish Corridor, which Germany had ceded under the Versailles Treaty. In response, Britain and France declared war on Germany on 3 September, surprising Hitler and prompting him to angrily ask Ribbentrop, "Now what?" France and Britain did not act on their declarations immediately, and on 17 September, Soviet forces invaded eastern Poland.
