The authoritative naval historian Bernard Ireland takes a fresh and fascinating look at the long and bitter struggle waged by the Allies against the Nazi U-boat threat. After sifting through evidence old and new, he questions the popular theory that it was a 'damn close-run thing'. He cites the massive resources that the United States brought to bear both at sea and in their shipyards, together with advances in technology and the breaking of German codes by Enigma. A closely argued work that demands reading.