The German attack on merchant shipping in the Second World War, known as the Battle of the Atlantic, was countered partly by code-breaking intelligence known as Ultra. The dramatic revelation of this factor in the middle 1970s resulted in many works giving this as the most important cause of Allied success.
'A highly professional, balanced and rigorous analysis that should have a wide appeal.' - Eric Grove, Deputy Director, Centre for Security Studies, The University of Hull
'This is a penetrating and powerful analysis. This book is of pivotal importance to naval history and required reading for every student of the conflict at sea during the Second World War.' - David Synett, Professor of History, Queen's College, The City University of New York
'This is a penetrating and powerful analysis. This book is of pivotal importance to naval history and required reading for every student of the conflict at sea during the Second World War.' - David Synett, Professor of History, Queen's College, The City University of New York