Man o' War, 1917–47, American racehorse, by Fair Play out of Mahubah, bred by August Belmont near Lexington, Ky., and owned by Samuel D. Riddle after 1918. A large reddish-colored colt capable of tremendously long strides, he raced only as a two-year-old and three-year-old, but in this short time (1919–20) won 20 out of 21 races and set five world records. His one loss was to a horse named Upset at Saratoga in 1919; he ran second. One of the most renowned stallions in the history of American thoroughbred racing, "Big Red," as Man o' War was often called, went on to become a leading sire.
See D. Ours, Man O' War: A Legend like Lightning (2006).