Tiger by the Tail

Ricardo Montalban guest-stars as a wounded bandit leader who is captured by the Cannons and tells them his followers will destroy them unless he is released.
When El Tigre's brother, Rafael, threatens to attack the ranch to free the notorious bandit, John Cannon has difficulty persuading his wranglers to hold the outlaw for trial in Tucson. During the attack Victoria frees El Tigre when he promises to leave peacefully and to stop the bloodshed, but he shows his true colors by making John his captive.

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S01E25 - The Peacemaker