Six men with varied and colorful backgrounds signed up for the adventure and after spending a week building a make-shift barrier across the mouth of a box canyon near Moab, the wranglers set out in search of wild mustangs. But after a shootout with Mexican bandits and a run in with starving Indians set on taking the horses for food, the men quickly discovered that rounding up wild horses would be the least of their challenges.
In 1887, Texas rancher, Peyton Masters, better known as "Punch" by his friends and fellow ranchers along the Pecos River because of his tendencies to settle arguments with his fists, is about to drive three hundred head of cattle from his ranch on the Pecos River to the railhead in Odessa. But on the night before the drive is to start, a band of rustlers suddenly appear out of the dark, killing the cowboys riding watch, and stampeding the herd.
In the fall of 1882, two bounty hunters track down Christian Gentry in the northern part of the New Mexico Territory and return him to the town of Paradise to stand trial for murder. When his brothers Justin and Charles Gentry hear of his arrest, they embark on a desperate race against time to save Christian from the hangman's noose and quickly discover their brother's fate is in the hands of a crooked town marshal and a double crossing cattle baron, who the locals call El Gato.
In 1885, providing whiskey to the remote mining camps spread throughout the Colorado Rockies was perhaps as lucrative a venture as the mines themselves. But, the whiskey peddlers quickly discovered that hauling whiskey to the mining camps was almost as risky as hauling the gold and silver out. After outlaws kill several of his drivers and hijack several shipments of whiskey, Nicholas Grant declares war on the hijackers and decides to start putting armed guards on his whiskey wagons.
Two years after Custer and 267 men from the Seventh Cavalry are killed at the Little Big Horn, a government survey party, mapping the remote Colorado backcountry, discovers that the inhabitants of a small mining camp have all been killed, scalped, and mutilated. Fearing that the massacre will trigger panic and widespread reprisals against the friendly Ute Indians, government officials cover up the massacre.
In the spring of 1889 a band of ex-convicts are preying on the remote ranchers and homesteaders along the Pecos River in west Texas. When the local law enforcement officials are unable to put an end to the string of horse thefts, rapes, and murders; two Texas Rangers are dispatched to the region to capture or dispose of the outlaws and put an end to the atrocities. The Rangers catch up to the outlaws, but during the ensuing shootout, one of the Rangers is wounded and Ranger Alvin Witherspoon turns to his old friend, Punch Masters, for help in bringing the bandits to justice.
In the spring of 1878 a handful of ranchers in the northeast corner of the Wyoming Territory pooled their money and entrusted it to fellow rancher, Gilbert Mack, to buy cattle in Denver and then drive the herd north to the small town of Recluse. After purchasing the cattle in Denver, Mack had them shipped by rail to Cheyenne where his longtime friend was waiting with nine other cowboys.
In 1884 Texas Ranger Captain Bernard Wallace and two other Texas Rangers are dispatched to the Texas Panhandle following a string of bank robberies and brutal murders. When the rangers discover that after each bank robbery the outlaws escape into the New Mexico Territory, Captain Wallace solicits the help of New Mexico Territorial Marshal, CW Gentry, to assist in tracking down the bandits.