This is the first modern one-volume history to challenge the orthodox view of the "Battle of the Atlantic that was established sixty years ago. It refutes the idea that the British were unprepared, restores the threat from surface raiders to its proper place, demonstrates that victory was never within Germany's grasp and argues the Ultra intelligence was not decisive. It fully integrates the huge outpouring of new material from Canada into a totally new model for the Atlantic war. At its heart, this book charts the development of U-boat capacities and provides the most sophisticated analysis yet in print of Allied tactics used to defeat them, including a comprehensive account of the final two years of the Atlantic war, a topic most popular histories ignore completely. Part of the Battles and Campaigns series, edited by Hew Strachan, Chichele Professor of the History of War at Oxford at Oxford University.