Montana Territory, 1866. It's summer, it's hot and the roads are dusty. The Diamond R Freight Company carries thousands of pounds of goods along those roads each day. At one point on the road is Sun River Crossing. It's a toll crossing and the cattlemen fight over it. Now the Diamond R teamsters are about to get caught up in that fight. It's summer, it's hot and things are about to get a whole lot hotter.