With the fall of France in 1940, Germany suddenly had the opportunity to strike at poorly guarded Allied convoys. The Luftwaffe pressed into service the Fw-200 Condor, a plane that had originally been designed as a civilian airliner and the first plane to fly non-stop from Berlin to New York in 1938. After various modifications, the Fw-200 became the Luftwaffe's long-range maritime patrol and strike bomber. It was devastatingly effective; a single...