Fairy Tale Princesses of the Civil War: Rattler and Celtic Magic — Sharyn McCrumb

Rattler, the curmudgeonly shaman of Sharyn McCrumb's Ballad novels, travels to the battlefield at Gettysburg to explore a supernatural element of the Civil War. Then, in Rattler and the Wild Hunt, Rattler confronts supernatural beings brought to the valley by the "new people". (Short Story).