No one had any doubt that the bombers would come. Defense planning began well before the war, though the planners had no specific threat in mind. Europe was Europe. If past experience was any sort of guide, a war could break out anywhere, anytime. Britain's military leaders saw the world through the lens of the empire's experience in the previous war, the Great War, with its mass slaughter of soldiers and civilians alike and the first systematic air raids of history, conducted over England and Scotland using bombs dropped from German zeppelins. The first of these occurred on the night of January 19, 1915, and was followed by more than fifty others, during which giant dirigibles drifting quietly over the English landscape dropped 162 tons of bombs that killed 557 people.
- From The Splendid and the Vile: A Saga of Churchill, Family, and Defiance During the Blitz by Erik Larson