Related Clues:

• Union enemy
• Memento from a battle
• Union deserter, maybe
• Proof of surgery, perhaps
• What a cut might cause
• Surgical souvenir
• Cutting-edge result?
• Protruding rock
• Natural wound cover
• Persona non grata at a strike
• The lightning bolt on Harry Potter's forehead, e.g.
• Road rash reminder
• ___ for life
• Union underminer
• Mark of old wound