Dead Man's Walk - Larry McMurtry - Simon and Schuster

As young Texas Rangers, Augustus McCrae and Woodrow Call ("Gus" and "Call" for short) have much to learn about survival in a land fraught with perils: not only the blazing heat and raging tornadoes, roiling rivers and merciless Indians, but also the deadly whims of soldiers. On their first expeditions—led by incompetent officers and accompanied by the robust, dauntless whore known as the Great Western—they will face death at the hands of the cunning Comanche war chief Buffalo Hump and the silent Apache Gomez. They will be astonished by the Mexican army. And Gus will meet the love of his life.