An Indian outbreak threatens to erupt when Billy Blue Cannon and an Apache boy fight over a wild horse.

Chatto, son of an Apache chief, first discovers the prized stallion, but fails in his attempt to capture it. When Billy Blue successfully ropes the horse, Chatto becomes infuriated with Cannon and steals it back. Billy Blue retaliates and a feud begins. Chief Natchez approaches John Cannon and warns him of trouble if Chatto loses the horse. The two boys meet and fight while High Chaparral wranglers and Apache braves watch and prepare for battle.