Tonto cuts a mask from the vest of the Ranger’s fallen brother.

To protect himself and his mission to bring Cavendish to justice, the Ranger decides to hide his identity. He believes that if the outlaws think all the Rangers are dead, he will have the advantage of surprise.

Hours later, a Native American named Tonto discovers the scene of the massacre. While checking the bodies, he finds one Ranger—Dan Reid’s younger brother—still clinging to life. Tonto carries the man to a hidden cave, nursing him back to health.

As the Ranger recovers, Tonto recognizes him from years prior, when the Ranger had saved Tonto's life as a boy. Tonto calls him which means "trusty scout" or "faithful friend." Birth of the Mask

If you'd like, I can provide more details on the or list the major differences between this 1949 pilot and the 2013 movie version.

While scouting, the Ranger finds a magnificent white stallion being attacked by a buffalo. He saves the horse and names him . With his new companion and Tonto by his side, the Lone Ranger tracks down the Cavendish gang.