As a young boy, "Frank" Parkman was found to be of poor health, and was sent to live with his maternal grandfather, who owned a 3,000-acre tract of wilderness in nearby Medford, Massachusetts, in the hopes that a more rustic lifestyle would make him more sturdy. In the four years he stayed there, Parkman developed his love of the forests, which would animate his historical research. Indeed, he would later summarize his books as "the history of the American forest." He learned how to sleep and hunt, and could survive in the wilderness like a true pioneer. He later even learned to ride bareback, a skill that would come in handy when he found himself living with theSioux.