The Comancheros (1961)

"Big Jake the Adventurer... Paul Regret the Gambler... Pilar the Gypsy beauty... Three With a Past... Destined to Cross and Clash... In a Kingdom of Killers!"
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Texas Ranger Jake Cutter arrests gambler Paul Regret, but soon finds himself teamed with his prisoner in an undercover effort to defeat a band of renegade arms merchants and thieves known as Comancheros.

John Wayneas Jake Cutter
Stuart Whitmanas Paul Regret
Ina Balinas Pilar Graile