Little Beaver finds that Apaches are disguising themselves as Navahos to steal Army horses. With the help of a turncoat Army scout, the Apaches hope to lure the soldiers into an ambush.; When outlaws rob the bank and make for the border, Little Beaver fools them by altering the mileage on a signpost.; The Army fort is overrun by mice. Little Beaver gets a cat from an traveling salesman, but on the way back the cat scares a band of Apaches who were planning on attacking the fort.