The twentieth century witnessed the development and perfection of many new weapons systems, which were pitted against each other in two merciless global conflicts. Commencing with a study of the dramatic impact that submarines had on World War I, in which the British Empire was nearly crippled by German U-boats, U-Boat examines the complacent reaction of the victors and the difficulties this left them with when war broke out again in 1939. It then moves on to address the crisis that afflicted British shipping as the U-boats enjoyed their first ‘Happy Time’ after the fall of France. U-Boat includes accounts of the attacks by U-boat commanders and their consequences, and examines the response made by Britain and the United States in a desperate attempt to overcome the threat posed by submarine warfare, and assesses the ebb and flow of the campaign as both sides gained and lost the advantage. U-Boat explores not only the actual events of various operations, but also the political battles, and the way in which the U-boats fought back. As well as an outstanding collection of photographs depicting all aspects of the U-boat war and the Allied counter-offensive, U-Boat contains superb artworks of the array of military equipment that was used to prosecute one of the key military campaigns in world history.