Colorado, 1861. Civil unrest is boiling into civil war. Union and Confederate armies posture and threaten, both Native Americans and Mexican landowners feel the pressure in an increasingly unfriendly area. The young town of Grimwood endures, founded in a gold rush this burgeoning town now supplies itself from nearby ranches and farms, trade and travelers provided by the railroad at Grimwood Terminus. But there's always trouble on the frontier, armies are about to clash, there are bandits in the hills, it's almost noon and someone called you yeller. Keep your hand near your iron, cowboy.