Don Arguello, in order to get the fortune of his ward, Princess Irma, insists that she marry him. The high-spirited girl repulses him as equally unworthy of love or respect, but temporizes with him. About this time Captain Falconbridge, of the U. S. Cavalry, who is stationed at the Mexican border, is introduced to Irma at Don Arguello’s home by Don Carlos, a high-grade young Mexican, who consorts with Americans. At a later visit Don Arguello happens on the scene and shows his immediate disapproval by insulting the American flag which Falconbridge has presented to Irma. This so incenses the soldier that he requests the ladies to leave the room while he gives the old roué a sound trouncing. He has completed this in satisfactory fashion, the furniture being wrecked in the struggle, when a detachment of Mexican soldiers arrive. Falconbridge escapes the vengeance of the reinforcements by leaping through a window. Irma, who is waiting the outcome of the fight in the garden, decides to fly over the border with the American and escape her vengeful and despised guardian. Don Carlos admires Irma, but unselfishly gives aid to this good cause. Close to the border the fleeing pair are forced to take refuge in an adobe. There they “stand off” the pursuing greasers until the boys of Falconbridge’s command, hearing the firing, and scenting trouble, ride over the border and make a daring rescue.