Why did the Royal Air Force rely on night bombing during World War II?

The Royal Air Force (RAF) shifted to night bombing during World War II primarily to reduce the vulnerability of its bomber crews to enemy fighter attacks. Early in the war, daylight raids on German targets resulted in prohibitive losses, as bombers proved far more susceptible to interception than anticipated. By operating under the cover of darkness, the RAF could largely evade enemy fighters, though this necessitated the development of advanced electronic navigation and target-marking techniques to overcome the inherent difficulty of locating targets at night.123

While night operations initially limited the RAF to attacking large areas rather than specific, individual targets, the introduction of specialized "Pathfinder" crews and electronic aids—such as the H2S radar system—eventually allowed for greater precision and effectiveness. This strategy became a cornerstone of the strategic air offensive, enabling the RAF to conduct mass area bombing campaigns against German industrial centers and infrastructure while keeping aircraft losses within barely acceptable limits.3124