This account is about an endurance race on horseback by a former Marine, written by a former Marine, for Mike Capron’s (another former Marine!) weekly stories, “Tales of Texas.” I first met Sarah Rinne, (now Sarah Smith) through the Homestead Leathernecks Detachment of the Marine Corps League, in Beatrice, Nebraska. Sarah has been active in the League and presently serves as the Detachment J…