"Clarence Smoyer began the war as a gentle giant, a factory worker from Pennsylvania coal country reluctant to unleash the power of the Sherman tank he crewed. But as his tank platoon fought its way from Normandy to the Rhine and beyond, and he watched his friends cut down one by one, he learned to kill with deadly accuracy and efficiency. His fight would climax in Cologne, in the shadow of the great cathedral, where he took a shot immortalized by...