How wartime experience changed fears of air and submarine attack

Did Churchill's concern about air power chiefly come from the Battle of Britain?

The reply emphasizes prewar reading and says wartime experience increased his concern about submarines while moderating earlier fears about bombers.

Churchill's prewar reading is offered as the main origin of his concern about air power. The discussion then contrasts increasing concern over the submarine war with greater confidence that air attack could be resisted. ASDIC had encouraged a belief that the submarine problem was solved, while the expectation of unstoppable bombers failed to match experience. The comparison follows how wartime experience changed these assumptions.