Vinnie, Colonel Beggs' daughter, complains to her father that Lieutenant Sterling is paying her unwelcome attentions. The Colonel assures his daughter that she has no cause for fear. He immediately forgets the incident, as important military developments occupy his time. But soon Vinnie has a more serious complaint, and the Colonel is forced to act. While on a short canter through the woods, Vinnie was again insulted by the forced attentions of Sterling. Fortunately, Sergeant Karr was nearby and he saved Vinnie from a disagreeable situation. The Colonel orders Sterling's arrest and later this untrustworthy officer is dismissed from service. Captain Sterling is now out for revenge. Not being satisfied with having broken his oath to Uncle Sam, "not to commit any act that is unbecoming of a gentleman and a soldier," he plans to immerse himself further in crime. In line with his plans for revenge, he engages a number of drunken Mexicans to aid him in kidnapping Vinnie and also to help him teach Sergeant Karr a lesson for interfering with the actions of a "superior officer." The degenerate soldier is temporarily successful in his plans, but Karr is fearless and, with indomitable courage, protects the girl he has begun to love.