Covered Wagon Trails (1940)

A wagon train of settlers is approaching Prairieville and rancher Allen is out to stop them by having some of his men join the train and poison the horses. When Jack Cameron arrives in Prairieville with replacement horses, he learns his brother who was with the train has been murdered. A piece of his brother's clothing identifies a member of the gang and Jack sets out to find the rest of them and also deliver the horses.