The Trans-Pecos War. The Fast Gun Series, #8

After drifting across Texas, Cormac Walsh finds steady work at the Rocking R Ranch in the hard country of the Trans-Pecos. When rancher Jed Blackwood turns a land feud into bloodshed, Cormac steps in to protect the Starr women, and inadvertently pulls the Rocking R into the fight. Outnumbered by outlaws and renegades, Cormac and the men of the 4S and Rocking R must stand together, riding for the brand before everything they've built burns.
Three years after the Civil War, the guns are roaring again... and in Southwest Texas, loyalty, courage, and a fast hand may be the only things keeping good men alive.