The action occurred during the French Intervention in Mexico during the second half of the XIX century. A revolutionary (chinaco), Pantaleón, takes a ranch whose owner is Don Julian. Guadalupe, Don Julián's daughter is about to marry Colonel Carrillo, Pantaleón's childhood friend. Pantaleón and Guadalupe fall in love. President Juárez asks Pantaleón to intercept an arm cargo but Guadalupe is found in the trunk and is accused to be a spy and condemned to death. Pantaleon must shoot Guadalupe, and, to avoid it, he proposed Carrillo to spare Guadalupe's life if he evacuates Morelia. Carrillo does it and is judge by high treason and shoot while Guadalupe becomes a revolutionary too and fight for Mexican freedom with Pantaleón.