Fighting Frontier is a 1943 Western film directed by Lambert Hillyer.
In the Old West, Kit Russell is identified as one of a gang of bandits that robs Commissioner SlocumâÂÂs stage en route to Marlin City, Arizona. However, both of the two identifying witnesses are threatened and KitâÂÂs case is dismissed for lack of evidence. It is revealed that Kit is actually an undercover investigator appointed by the governor to infiltrate the gang and discover its leader. KitâÂÂs girlfriend, Jeannie, is unaware of KitâÂÂs assignment and thinks he has turned into a criminal. The gang steals gold from Walton Mining Company. Frustrated by lack of justice, the mineâÂÂs owner, Frank Walton, forms a vigilante posse. WaltonâÂÂs men locate the banditsâ hideout. A gunfight ensues and the vigilantes breach the hideout, capturing Kit. Walton refuses to turn the outlaws over to the sheriff, but allows Judge Halvorsen, JeannieâÂÂs father, to see Kit. The judge, aware of KitâÂÂs undercover role, encourages Kit to reveal himself to Walton, but Kit refuses. Kit and the rest of the gang are convicted by the vigilante court and sentenced to hang. Kit discovers Commissioner Slocum is the boss of the outlaw gang and tells Walton, who doesnâÂÂt believe him. Kit knocks out the guard and escapes with his pal, Ike. Slocum, aware of KitâÂÂs mission, prepares to leave town. Kit intervenes and a gunfight ensues. SlocumâÂÂs gang surrenders, but Slocum escapes on a buckboard and is pursued by Kit. Kit catches Slocum, subdues him and turns him over to the sheriff. Kit and Jeannie are reconciled.