After the treacherous murder of their peace-seeking Indian chief, his tribe seeks revenge. The Indians plan to attack a military convoy transporting supplies from Fort Apache to Fort Yuma. The trek is led by Lieutenant Ben Keegan, a passionate Indian-hater. Keegan is divided inside, however, because he loves the young Apache squaw Francesca. Of all people, Francesca's brother, Sergeant Jonas, is assigned to Keegan as a scout. After several Indian attacks, the convoy is soon completely wiped out. In order to deceive the guards of Fort Yuma, the Indians take the army uniforms off the fallen soldiers. Fort Yuma is in grave danger. Keegan has the chance to prevent the bloodbath at Fort Yuma. But to do so, he must jump over his own shadow and cooperate with the hated Apache Jonas.