The length, scale and intensity of the Battle of the Atlantic led the British and German navies to make substantial changes to their organisation, strategy and tactics. In this book, Dennis Haslop examines the pivotal lessons learned, and how these helped to determine the outcome of the Battle of the Atlantic Convoy War. He questions how well adapted the two organisations were to learn from the conflict, and how effective they were in identifying problems and producing remedies. Based on the in-depth analysis of British and German primary sources, this study provides an innovative basis against which to assess the German and British approach to changing warfare and provides important new insights into aspects of convoy warfare, in particular the virtually unknown subject of German ”Operational Research”.