Runaway slaves take refugee in the middle of the forest. Trying to find a better way to live, they live by the land, for the land. With friends among some indians and a very equalitarian society. Those were the Quilombos, and they can be found on a lot of places among the Terra de Santa Cruz.
This book is a setting for O Desafio dos Bandeirantes. It has rules for playing a escaped slave, and living the life among them in a Quilombo. You can find rules for the capitães-do-mato (Grass Captains). The fighters hired by the government and the big land owners to hunt and fight those that escaped.
And as a bonus, rules for characters playing Capoeira.