Title: The U-boat arm
Subjects: Design and construction, German Naval operations, Germany, Germany. Kriegsmarine, History, Naval operations, Submarine, Submarine forces, Submarines (Ships), World War, 1939-1945, Ships, history, World war, 1939-1945, naval operations, submarine, World war, 1939-1945, naval operations, german
Places: Germany
People: Karl Dönitz (1891-1980)