The distinguished military historian here studies the two unrestricted U-Boat wars of 1916-1918 and 1939-1945.
- ISBN10 0850527600
- ISBN13 9780850527605
- Publish Date 14 September 1993 (first published 1 November 1990)
- Publish Status Active
- Out of Print 24 March 2021
- Publish Country GB
- Imprint Pen & Sword Books Ltd
- Format Hardcover
- Pages 432
- Language English