 Complete the following phrase:  The King declared war on Nazi Germany in September 1939, after the German invasion of Poland. During the quiet period of phoney war, the British sent to France the most highly mechanized army in the world; together with France they had more tanks than Germany, but fewer warplanes. The smashing German victory in Spring 1940 was due entirely to superior combat doctrine. Realistic training, imaginative battlefield leadership, and unparalleled initiative from generals down to sergeants. The British with the thinnest of margins 