At Fort Quitman, a convoy is leaving with weapons and ammunition for an army that is being raised to attack the Apaches. Blueberry doesn't agree with the plan, but decides to escort the convoy. He has to do his best to outwit the indians, who seem always one step ahead. Quanah, the convoy's guide, seems to be one of the main causes. Problems accumulate, and Blueberry has to leave the convoy to the man officially in charge, O'Reilly, an incompetent alcoholic who is easily fooled by Quanah. The Apaches attack the convoy, but Blueberry manages to stop them. Quanah, wich means "Lone Eagle", loses the tribe's support and starts to fight on his own.