Comanche Moon by Larry McMurtry
The further adventures of Gus and Gall in the prequel to lonesome Dove. Set against the long, bitter frontier fighting that set white man against Comanche Indian, Comanche Moon follows the adventures of Gus and Call, now Texas Rangers under the command of Captain Inish Scull. When Sculls favourite horse is stolen by the Comanches, he decides to track him down, leaving Gus and Call in charge. But they soon discover that if there's 1 thing more troublesome than Indian's, it's women. When Madam Scull despatches them to find her errant husband, the rangers are relieved to escape - only to find that it is just the start of their adventures.