Man o' War didn't run in the Kentucky Derby because owner Sam Riddle thought the distance was too long for 3-year-olds that early in the year. But nearly two decades later, Riddle had a change of heart. In 1937, he agreed to run War Admiral, a son of the great Man o' War, in the Derby. War Admiral swept the Triple Crown and established himself as Man o' War's best son. Author Edward L. Bowen, biographer of Man o' War, chronicles the exploits of his son, including War Admiral's historic battle with the great Seabiscuit.