Once They Wore the Gray — Johnny D. Boggs

For Sergeant Gil Metairie and other Confederate prisoners during the War Between the States, life in captivity is more dangerous than fighting in the front lines. The deplorable conditions force many prisoners--including Gil--to become "Galvanized Yankees," former Confederate soldiers who join the Union Army to fight Indians out West. But life on the frontier is no easier. The Union troops don't trust them, and the Indians are looking only for a way to rid their lands of all white men forever. Surrounded by enemies, the Galvanized Yankees have to fight harder than ever to survive--battling threats on both sides of the fort's walls.