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A patrol headed by Captain Haven and Sergeant Franklyn is sent to investigate the theft of 2,000 rifles from a U. S. Cavalry command. The trail leads to James Lassiter, who owns one of the stolen rifles, but he refuses to reveal the name of his contact and is jailed with Rodriguez, a Mexican murderer. Haven plans to take a wagonload of gunpowder to Mexico, hoping to use it as bait for those who stole the rifles. In exchange for both his and the Mexican's freedom, Lassiter finally agrees to lead Haven to Pardee, the man from whom he obtained the rifle. Pardee, who was Lassiter's commander during the Civil War, is still fighting the war from Mexico. Captain Haven and his patrol have skirmishes with Indians and bandits along the way, and they pick up Sally, a young Indian woman. Lassiter, who hates Indians because they killed his family, wants to kill her, but they learn from her that Pardee is about to sell the rifles to Apaches. The traitorous Rodriguez escapes, but Lassiter finds and kills him. Lassiter begins talks with Pardee, but when Bloodshirt, the Indian who killed his family, appears, Lassiter goes berserk and attacks him. Pardee imprisons Lassiter, Haven, and Franklyn; but Sally frees them while Pardee negotiates with Bloodshirt. Lassiter and Franklyn sacrifice their lives to ignite the gunpowder wagon, destroying the camp and killing everyone except Haven and Sally, who return to Texas.