Cyclone Fury (1951)

Johnny is a young Indian boy who falls heir to thousands of wild horses when his adoptive white father is murdered by henchmen of the town's leading citizen, Grat Hanlon. With the aid of his protector Steve Reynolds, he acquires an Army contract to deliver 300 horses a month to the cavalry. Hanlon, desiring the contract himself, and his men set out to keep the contract from being fulfilled.