Bite the Bullet (1975)

Gene Hackman, James Coburn, Candice Bergen, Dabney Coleman

In 1908, a newspaper organizes an endurance horse race through the desert: 700 miles to run in a few days. Nine adventurers are competing, among them a woman with unclear motives, a Mexican, an Englishman, a young gunfighter, an old cowboy and two friends from their days with the Rough Riders in Cub