Staplehurst, 1st. ed., 2002. 176 pp., profusely illustrated with photographs + cold. art work. D.j., 32 x 24cm. FINE. This splendid pictorial study opens with a brief account of the development of the submarine in the First World War during which German U-boats posed a deadly threat to the outcome of the conflict. Too little was done between the wars to prepare Britain and her Allies for the new wave of U-boats that put to sea in 1939, eventually in wolfpacks, wreaking havoc on Allied convoys. The author examines the British and American response to the only threat in the war that kept Churchill awake at night. The question is addressed as to whether the U-boats posed a mortal danger to the Allied war effort or whether they were always at a disadvantage ' doomed to defeat ' despite the courage and daring of their commanders. Both the sea battles and the political battles are examined ; the technical advances on both sides explained ; the whole being supported by numerous photographs and fine coloured art-work of U-boats, aircraft carriers, surface vessels, various aircraft, etc.