Forbidden Valley (1938)

Ring Hazzard, a young man raised to manhood in a secret canyon by his father, a fugitive from a false murder charge, meets his first female by saving Wilda Lanning, a rancher's daughter, from a wild horse stampede. A wild bronco kills his father, and Ring and Wilda leave the valley with a herd of mustangs, captured by Ring, to sell them in Gunsight. Along the way, Wilda is bitten by a rattlesnake and Ring has to leave his herd to take her to a doctor. Matt Rogan drives Ring's herd into town as his own, and the first of many conflicts and problems facing the young man begins.