The cowboys of Fenton's Quarry quarrel with a party of Mexicans, and during the scrimmage one of their number draws his revolver and shoots at the leader of the Mexican party. He is pursued by the police and finally captured. During his transit from the prison to the train he manages to arrange that his friends shall come to the rescue. This they determine to do, and it results in the express being hold up. The cowboy is rescued, and accompanied by whoops and shots in the air the desperate ranchers ride back to the quarry to celebrate their victory.