Hans Rose was Germany's fifth most successful U-boat Ace during World War I, and its most successful ace during the convoy period when attacks by U-boats were the most dangerous. This meticulously researched, lively biography examines German WWI submarine operations through his eyes. The authors convey a visceral sense of life aboard a wartime submarine, and provide a window into the dilemmas confronting German military officers as their nation spiraled into Nazism. Rose became Sea Commander of occupied Norway. This book is the only time the Rose family has agreed to make Hans Rose's personal papers available to any researcher or biographer.