Born to Buck (1966)
Bronco riders travel through South Dakota and round up 400 wild horses in danger of extinction, then bring them to Fort Pierre where they are ridden by broncobusters in rodeo competition.
Directed by: Casey Tibbs
Starring: Henry Fonda, Rex Allen, Casey Tibbs, Ken Cooper, Bud Dancey, Dallis Gifford
Links: IMDb, Movie posters, Movie stills