The 1910 Mexican Revolution is on its way when six brave peasants, known as "Los Leones de San Pablo", decide to join Pancho Villa's army and help end the suffering in their community by assisting in the struggle. Together, they will endure the tragedies and hardships of a civil war.

Texas Ranger Chuck Williams is the bashful sweetheart of the daughter, Ellen, of the captain of his Texas Rangers troop. He is working with the Mexican Rurales in an effort to stop a gang of gun runners. The gang-leader shows up, posing as an artist, and Ellen takes him in as a boarder to make Chuck jealous. But Chuck is wise to the boarder, who kidnaps Ellen and heads for the mountain hideout of his gang.