On June 17, 1940, The defeated French signed an armistice and quit WW II, leaving Britain standing alone against Germany. In the Summer and fall of that year, German and British forces clashed in the skies over Britain in the first all-air battle in history.
A significant turning point in WW II, the Battle of Britain ended when Germany's Luftwaffe failed to gain air superiority over the Royal Air Force . Britain's decisive victory saved the country from a ground invasion from the enemy and proved air power alone could also be used to win a major battle.