After shooting a Union soldier in her front hall with a pocket pistol, Belle Boyd became a courier and spy for the Confederate army, using her charms to seduce men on both sides. Emma Edmonds cut off her hair and assumed the identity of a man to enlist as a Union private, witnessing the bloodiest battles of the Civil War. The beautiful widow, Rose O'Neale Greenhow, engaged in affairs with powerful Northern politicians to gather intelligence for the...