Air raid sirens wail, searchlight beams flash across the sky, and the night is aflame with tracer fire and aerial explosions, as Allied bombers and German anti-aircraft units duel in the thundering darkness. Such "cinematic" scenes, played out with increasing frequency as World War II ground to a close, were more than mere stock material for movie melodramas. As Edward Westermann reveals, they point to a key but largely unappreciated aspect of the...