In December 1860, along a creek in northwest Texas, a group of U.S. Cavalry under Sgt. John Spangler and Texas Rangers led by Sul Ross raided a Comanche hunting camp, killed several Indians, and took three prisoners. One was the woman they would identify as Cynthia Ann Parker, taken captive from her white family as a child a quarter century before. The reports of these events had implications far and near. For Ross, they helped make a political career. For Parker, they separated her permanently and fatally from her Comanche husband and two of her children. For Texas, they became the stuff of...