Operation Sea Lion was the German code name for the planned invasion of Britain during the Second World War. The operation commenced with bombing raids (the Battle of Britain) in 1940 designed to eliminate the RAF and thus British air cover, before the ground troops could arrive in barges from Europe. However, the Luftwaffe failed to destroy the RAF, and instead suffered heavy losses themselves (in part due to the British secret weapon RADAR, which allowed the British advance notice of approaching aircraft formations and allowed concentrated efforts of the smaller RAF to be made against the German forces). The operation was abandoned in October with the perceived failure of the Germans to gain air-superiority, though in reality Britain had very few aircraft and crews. Research Operation Sea Lion