Lyedecker (Jim Brown) is the Arizona lawman who travels to Mexico in search of Yaqui Joe (Burt Reynolds). Joe has made an illegal withdrawal of $6,000 from the band in Phoenix to help finance his tribes's uprising against the Mexican government. Sarita (Raquel Welch) is the local woman who is friendly towards the Indian leaders. Both men are tracked by General Verdugo (Fernando Lamas), the career-minded military man who realizes a victory could boost his station in high-society and politics. Also on hand is the American railroad agent Grimes (Dan O'Herlihy). The battle ensues between the Indians and the government troops as Lyedecker and Joe form a temporary alliance to survive. They are captured by the troops, but the Indians instead of the calvary come to the rescue in this routine western taken from a novel by Robert MacLeod.