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While testing a new signaling device, Rusty and Rin Tin Tin come across a marshal with a dangerous prisoner.
Rinty gets separated from the troop and has to travel 1500 miles from Kansas City to Fort Apache and has several adventures along the way
O'Hara is captured by the indians and Rinty, Rusty and an old-time bugler help save him and keep the Troop from riding into a trap.
The colonel, Rusty and Rinty head to Canada to help the newly formed Canadian Mounties with their Indian tactics.