While crossing the desert, a frontier scout, Jess Remsberg, rescues Ellen Grange from a pursuing band of Apaches, and returns her to her husband, Willard Grange. He is contracted to act as a scout for an Army cavalry unit. Willard, Ellen, and her infant son are along for the ride, as is horse trader Toller, a veteran of the 10th Cavalry. The party is trapped in a canyon by Chata, an Apache chief and grandfather of Ellen's baby. Willard is captured and tortured. Jess sneaks away and brings reinforcements just in time to save the day. Jess learns that the man he has been hunting is none other than Willard Grange.
You can now watch Duel at Diablo online on the following streaming providers in the United States.
| Editing | Fredric Steinkamp | Editor |
| Art | Alfred Ybarra | Art Direction |
| Camera | Charles F. Wheeler | Director of Photography |
| Writing | Marvin H. Albert | Novel |
| Art | Victor A. Gangelin | Set Decoration |
| Production | Fred Engel | Producer |
| Production | Ralph Nelson | Producer |
| Directing | Ralph Nelson | Director |
| Writing | Michael M. Grilikhes | Screenplay |
| Sound | Neal Hefti | Original Music Composer |
| Crew | Bobby Somers | Stunts |
| Production | James Garner | Producer |
| Costume & Make-Up | Yvonne Wood | Costume Design |
| Costume & Make-Up | Gustaf Norin | Makeup Artist |
| Production | J. Paul Popkin | Production Supervisor |
| Directing | Phil Cook | Assistant Director |
| Directing | Emmett Emerson | Assistant Director |
| Crew | Roscoe Cline | Special Effects |
| Editing | Allan Jacobs | Assistant Editor |
| Sound | Richard Carruth | Music Editor |
| Costume & Make-Up | Eddie Armand | Wardrobe Designer |
| Crew | Al Wyatt Sr. | Stunt Coordinator |
