Synonymous with such infamous battleships as the "Bismarck", "Scharnhorst" and "Tirpitz", the German Navy (or Reichsmarine) was renamed the Kriegsmarine in 1935, shortly after the emergence of the Nazi State, and went through a major re-organization in 1939. During World War II, it became a much-feared adversary both on and beneath the high seas, with its marauding U-boat "wolf packs" coming close to defeating Britain in the Battle of the Atlantic. The author of this text examines the different roles of the Fleet, and its organization and training activities during the war years. Incidents and operations are described, together with technical data for ships, U-boats and their weaponry. A guide to German Navy uniforms and insignia is inlcuded, together with full details of rank structure and specialist trades.