A young corporal in the United States Cavalry in the Black Hills is very much in love with a young ranchman's daughter who lives near the military barracks. He asks her to marry him and she promises to do so when he has won his third stripe, making him sergeant. It is not long before he receives an assignment from his superior officer to carry an important dispatch to the commanding general at Fort Darrow. In the successful fulfillment of his mission he would be promoted to the office of sergeant, secure his third stripe and his girl.