The series centers on Lucas McCain, a Union Civil War veteran and widower. McCain had been a lieutenant in the 11th Indiana Infantry Regiment, and he had received a battlefield commission at the Battle of Five Forks just before the end of the war. (This conflicts with episode 3/25, "The Prisoner", in which a former Confederate cavalry major states that he was Lieutenant McCain's prisoner after the Battle of Fort Donelson.) Having previously been a homesteader, McCain buys a ranch outside the fictitious town of North Fork, New Mexico Territory, in the pilot episode. His son Mark and he had come from Enid, Oklahoma, following the death of his wife, Margaret (nee Gibbs), when his son was six years old. The citizens of North Fork are sometimes willing to subject themselves to tyranny, showing themselves to be cowards in several episodes.