Read it through once

Outside of the house the two boys were together all through their boyhood. Chambers was strong beyond his years, and a good fighter; strong because he was coarsely fed and hard worked about the house, and a good fighter because Tom furnished him plenty of practice--on white boys whom he hated and was afraid of. Chambers was his constant body-guard, to and from school; he was present on the playground at recess to protect his charge. He fought himself into such a formidable reputation, by and by, that Tom could have changed clothes with him, and "ridden in peace," like Sir Kay in Launcelot's armor.