“Britain’s civil defense experts, fearing a “knock-out blow,” predicted that the first aerial attack on London would destroy much if not all of the city and kill two hundred thousand civilians. “It was widely believed that London would be reduced to rubble within minutes of war being declared,” wrote one junior official.”

“Britain’s civil defense experts, fearing a “knock-out blow,” predicted that the first aerial attack on London would destroy much if not all of the city and kill two hundred thousand civilians. “It was widely believed that London would be reduced to rubble within minutes of war being declared,” wrote one junior official.”

— Erik Larson