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The story of HMS Petard
By Connell, G. G.
Descripton: A true account of H.M.S. Petard's first commission during WWII. Petard was the only Allied ship to sink submarines from all three Axis powers as well as capturing codebooks in October 1942, which allowed the Allies to break back into the improved Enigma cipher and read U-boat communications until the end of the war. First published 1976.
The following pages link to this title
Allied Warships. HMS Petard