The second book in Grant’s trilogy covering the war against the U-boats shows how the Intelligence Division of the Admiralty played a key role in the defeat of the U-boats in World War I. With the assistance of the Naval Historical Branch of the Ministry of Defence and the Director of Naval History in Washington, Professor Grant has been able to piece together the crucial role played by naval intelligence in the victory at sea 1914-1918. pp. 195 illusts First Edition #0120 Submarine Maritime Naval Warfare