Strategic bombing
However, the strategic bombing in World War II was on a far larger scale than anything which went before. First, In the Battle of Britain the German Air Force almost defeated Britain by attacking the Royal Air Force planes on the ground. This was partly successful, and some think it was a mistake to switch to other targets. The British had primitive radar, good enough to know whereabouts each attack was going. There was time to get the fighters in the air to intercept and damage the attacks.