Trampas, looking forward to the big dance in town, is sent instead by the Virginian to Mexico to return with a bull purchased by Judge Garth. While in Laredo waiting to cross over into Mexico, Trampas becomes involved in fights with three Texas Rangers over the beautiful red haired singer and saloon owner, Carmelita Flanagan. The three Rangers are sent by Captain Parmalee to look for a lost train carrying gold. Trampas and the Rangers leave Laredo at the same time and direction so he travels with them. They find the train with the crew killed, gold stolen, and a baby alive from the family of one of the crewmen. Trampas goes with them into Mexico to recover money stolen from the train and to save the baby which needs milk. After crossing the Rio Grande, they run into the Mexican Federales who order them back to Texas but the Rangers ignore the order to take the baby to Mama Dolores in a nearby town. There they are attacked by the Yaqui Indians. The men realize they may be involved in the robbery to pay for guns. Trampas tries to go his own way but finds himself back with them captured by the Yaqui and gun runners.
—Anonymous