As Adolf Hitler and Nazism showed off their aggressive momentum in Europe, Chamberlain, the Prime Minister, found his policy of appeasement of German aggression was no longer tenable, and was forced to declare war on Germany on September 3,1939.

• 当阿道夫希特勒及纳粹主义显示他们对欧洲的侵略意图时，首相张伯伦发现他的绥靖政策已站不住脚，只得于1939年9月3日对德宣战。