Rio Conchos is a Cinemascope western released in 1964 and directed by Gordon Douglas. The movie's plot centers on an ex-Confederate army officer named Lassiter (Richard Boone). Lassiter, while enacting revenge on Apache Indians responsible for the massacre of his family, recovers a stolen United States Army rifle from one of the warriors he kills. The U.S. Army arrests Lassiter and offers him his freedom in exchange for agreeing to lead a small clandestine scouting unit into Mexico to search for more Apaches. The scouting unit consists of an Army Captain (Stuart Whitman), a Buffalo Soldier Sergeant (ex-NFL superstar Jim Brown in his first film role), a knife wielding Mexican prisoner (Tony Franciosa) and a female Apache Warrior (Wende Wagner). After fighting their way through bandits and Apaches, the group discovers that a former Confederate (Edmond O'brien) has set up new Confederate headquarters, and is selling guns to the Apaches, including the ones that slaughtered Lassiter's family.