We are in a cabin deep down below decks on a Navy ship jam-packed with troops that’s pitching and creaking its way across the Atlantic in a winter gale. There is a man in every bunk. There’s a man wedged into every corner. There’s a man in every chair. The air is dense with cigarette smoke and with the staleness of packed troops and sour wool. “Don’t think I’m sticking up for the Germans,” puts in the lanky young captain in the upper berth, “but…” “To hell with the Germans,” says the broad-shouldered dark lieutenant. “It’s what our boys...