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In the town of Eagle Pass in the New Mexico territory, Sheriff Hanley seems powerless to stop the outlaws who are forcing the surrounding ranchers to pay for "protection" from their own ruffians. Frustrated with the sheriff's lack of progress, town newspaper editor Dan Forester, his daughter Anita and rancher Jamison send for U.S. Marshal Whip Wilson. While Whip makes his way from Texas to Eagle Pass with his deputy, Jud Calvert, local tippler Blinkey inadvertently informs three of the outlaws, Jack Gatlin, Bill Longley and Curt Blake, of Whip's imminent arrival. The outlaws attempt to kill Whip and Jud on the trail, but the lawmen evade them and enter the town. There, Whip recognizes local business owner Duke Kirby as a wanted murderer, and deduces that Kirby is the leader of the outlaw gang. Kirby arranges for the gang to destroy the newspaper offices, but Whip arrives in time to thwart their plan. Soon after, the gang kills a local rancher, after which the Eagle Pass citizens unite in rage. Together, they capture one of the gang and terrify the gang by threatening to lynch him and then kill off the other members. Whip, who has suspected Hanley's involvement all along, convinces the sheriff to confess that Kirby is the gang leader. Whip confronts Kirby, only to discover that the gang has captured Dan. With the help of Blinkey, Whip and Jud free Dan, but Kirby and Gatlin seize the opportunity to flee town. Whip follows and, after a long chase, arrests them both.