Confederate Colonel John Singleton Mosby (1833-1916) was only one of a number of heroes to emerge during the Civil War, yet he holds a singular place in the American imagination. He is the irrepressible rebel with a cause, the horseman who emerges from the forest to protect the embattled farmer and his household and bring retribution to the invader. Mosby was the fabled 'Gray Ghost' of the Confederacy, a mythic cavalry officer who operated with virtual...