In 1804, John Colter set out with Meriwether Lewis and William Clark on the first U.S. expedition to traverse the North American continent. During the twenty-eight month ordeal, Colter served as a hunter and scout, and honed his survival skills on the western frontier. But when the journey was over, Colter stayed behind, spending four more years trekking alone through dangerous and unfamiliar territory. Along the way, he charted some of the West's...