Released by the Department of the Navy, Naval Security Group Command Headquarters, this unique publication is a collection of U.S. intelligence reports based on intercepted German messages. These intelligence reports originally were bound in three volumes:
I. Allied Communication Intelligence and the Battle of the Atlantic. Chapters include information on the nature of the U-boat war: the Germans' strengths, weaknesses, number of vessels sunk, and naval tactics.
II. U-Boat Operations. This volume gives a comprehensive overview of this topic, including Germany's submarine offensive against convoys, its defeat in the North Atlantic, and its operations against U.S. and British convoys.
III. German Naval Communications Intelligence. This volume covers the organization of a vital branch of the German military.