The Dawn Trail: Dissension arises between cattlemen in Osage County, Texas, and sheepherders who have settled there and use the same watering stream. Mart Dalton, son of a wealthy cattleman, quarrels with and kills one of the settlers, thus placing sheriff Larry Williams in a delicate position; for he is Mart's best friend and is engaged to Mart's sister June. However, sworn to do his duty, he arrests Mart, incensing the cattlemen, who help Mart escape, leaving Larry wounded.