Wikipedia
Chisum
Chisum is a 1970 Warner Bros. Technicolor Western film starring John Wayne.
The large cast also includes Forrest Tucker, Christopher George, Ben Johnson, Glenn Corbett, Geoffrey Deuel, Andrew Prine, Bruce Cabot, Patric Knowles, and Richard Jaeckel.
Directed by Andrew V. McLaglen, it was adapted for the screen by Andrew J. Fenady from his short story, "Chisum and the Lincoln County Cattle War".
Although this movie is historically inaccurate in many details, it is loosely based on events and characters from the Lincoln County War of 1878 in New Mexico Territory, which involved Pat Garrett and Billy the Kid among others.