Rawhide Ransom by Doyle Trent

An action-packed story of kidnapping and revenge by the author of Night Rider and Dead Man's Badge. The $5000 reward for the return of the kidnapped redhead was just what Lem Pettigrew needed to pull his small herd through the upcoming Colorado winter. But Lem didn't know the men he was tracking--and killing four of them had gotten the U.S. marshal on his tail.