On 24 August, German night bombers aiming for the airfields accidentally destroyed several London homes due to a navigation error, killing civilians. Churchill retaliated immediately by bombing Berlin the following night.
Starting on 7 September 1940, London was bombed by the Luftwaffe for 57 consecutive nights, and other British cities were targeted. But a real turning point in Britain’s fortunes in the war occurred on 15 September.
In an attempt to shatter British morale, now that an invasion began to seem increasingly unrealistic, Hitler sent two enormous waves of German bombers. But their attacks were scattered by the RAF; the German defeat caused Hitler to order, two days later, the postponement of preparations for the invasion. In the face of mounting losses of men and aircraft, the Luftwaffe switched from daylight to night-time bombing and although fighting continued in the air for several more weeks, and British cities continued to be bombed, German tactics to achieve air superiority ahead of an invasion had failed.