The Dieppe Raid is one of World War II's most controversial hours. In 1942, a full two years before D-Day, thousands of men, mostly Canadian troops eager for their first taste of battle, were sent across the Channel in a raid on the French port town of Dieppe. Air supremacy was not secured; the topography of the town and its surroundings - hemmed in by tall cliffs and steep beaches - meant any invasion was improbably difficult; the result was carnage,...