In the 1860s Old West, trail boss Gil Favor leads communal cattle drives across rugged country with the help of his trusted foreman, Rowdy Yates. As the drovers move their herds from one place to the next, the demands of the trail bring them into encounters shaped by danger, hardship, adventure, and drama. Season 4 continues the story of men working together to keep the cattle moving through an unpredictable frontier.