Captain Bennett discusses the traumatic effects of the Washington and London Naval Treaties on the fleets of the principal powers between the wars, and their astonishing growth and technical progress between 1939 and 1945. He then deals with the war in the Atlantic and the Mediterranean. The Battle of the River Plate, the struggle for Narvik, the hunt for the Bismarck, the destruction of the Italian Fleet at Taranto and Matapan are all vividly described and authoritatively analysed.