In June 1940, Adolf Hitler’s Germany was on the march through Europe, toppling Western democracies one after another. Britain was left on its own to tackle this onslaught. Adolf Hitler planned to invade Britain, and in July 1940 used the German air force Luftwaffe to destroy integral British ports in preparation. The RAF fliers – who were outnumbered by the German planes – put up fierce opposition in what became known as the Battle of Britain. Through radar technology, more manouverable aircraft, and great bravery, the RAF pilots were able to keep the German invasion at bay. For every RAF plane shot down, two Luftwaffe warplanes were destroyed. The German invasion of Britain was delayed indefinitely, and in May 1941 the Battle of Britain came to an end.