Sons of the Saddle (1930)

Jim Brandon, foreman of the Wind River Ranch, owned by Martin Stavnow, is in love with Ronnie, the rancher's daughter, though he is unaware that Harvey, a youthful cowhand, also loves her. Thus, Jim asks the boy, whom he protects like a brother, to speak for him. When he is spurned by Ronnie, Harvey decides to join Red Slade's gang, who are plotting a raid on the Wind River herd. As Jim forcibly attempts to separate him from the gang, Harvey is killed; and through the aid of his horse, Tarzan, Jim foils Slade's attempt to stampede the herd. Slade takes refuge in a wagon where Ronnie is hiding; Jim rescues Ronnie from the wagon just before the runaway team plunges over a cliff with Slade riding to his doom.