Commanche Run got his first win twelve days later on 28 May at Doncaster Racecourse. Moving up in company, the colt ran third in the 1984 King Edward VII Stakes and the Princess of Wales's Stakes, then won his next two starts at Goodwood Racecourse, taking both the Gordon and the March Stakes. Under jockey Lester Piggott, Commanche Run went on to win three Group One races, capturing the Benson & Hedges Gold Cup, Irish Champion Stakes and the Classic St. Leger Stakes. Retired to stud duty at Coolmore Stud in Ireland, Commanche Run met with limited success. In 1999 he was
American St. Leger Stakes American St. Leger Stakes The American St. Leger Stakes is a Grade 3 flat horse race in the United States for thoroughbreds three-year-old and older. It is run over a distance of . Held annually in mid August, it is held on the same racecard as the Arlington Million, Beverly D. Stakes and Secretariat Stakes and on the same turf course at Arlington Park, Arlington Heights, Illinois. The race was upgraded to Grade 3 status in 2015. It was dropped from Arlington Park's calendar in 2018 with no immediate indication of whether it would be returning in any future year.