Rio Conchos is a 1964 Western starring Stuart Whitman, Richard Boone, Jim Brown, Edmund O'Brien and Tony Franciosa. The music is by the prolific Jerry Goldsmith. Director Gordon Douglas, who began his film career as a child actor, has directoral credits from 1934 to 1977. This is another fine Western. Why are there so many good Westerns I've never heard of? Sad. But discovering them is fun.
DVD Talk says, "Rio Conchos on the surface may look like a mid-sized studio Western with second-tier stars, but it's surprising hefty when it comes to mixing ideas and action." TCM has an overview. It has a 40% critics rating at Rotten Tomatoes.