Final answer:
The German Air Force (Luftwaffe) started bombing London in 1940 to weaken the British resistance and gain control of the skies over Britain.
Step-by-step explanation:
The German Air Force, also known as the Luftwaffe, started bombing London in 1940 as part of a larger strategy to break the British will to resist and gain control of the skies over Britain. The Luftwaffe conducted nightly bombing raids with the objective to destroy the British Royal Air Force (RAF) and weaken British defenses. These bombings were intended to pave the way for a potential invasion of Britain by ground troops without facing strong opposition from the air and ground.