Related Clues:

• 28 Across, to a Yank
• Ones against us
• "Them"
• They might be engaged
• The Grays, to the Blues
• One to keep closer?
• Any Hatfield, to a McCoy
• Parley participant
• Hostile opponent
• Armed adversary
• Military adversary
• Scipio, to Hannibal
• Military opponent
• The Riddler, to Batman
• Axis powers, to the Allies