Shortly after the conquest of Western Europe, Germany attacked the United Kingdom. It had to do so by air because the British Navy was stronger than the German Navy. In July 1940, Germany started making air raids on ports and ships, airports, and places along the coast of England. Hitler had planned to invade England with an army, but this turned out to be impracticable because the German Air Force was unable to gain the upper hand. On 25 August 1940, the British Air Force bombed Berlin. This counter-attack did not cause much damage, but it did change the German plans.
Starting on 7 September, London was bombed for 57 consecutive days, and other English cities were hit hard as well. The German air raids continued into the autumn of 1941. They are collectively called "The Blitz", after the German word for lightning.
The Battle of Britain cost 27,450 lives and even more people were wounded. More than a million houses were destroyed. But the United Kingdom did not succumb, and Germany lost the Battle of Britain.