Related Clues:

• Battle groups
• Antagonists
• Nemeses
• The Hatfields and the McCoys, e.g.
• ''Them''
• The Blue and the Gray, once
• Enemies
• They're not on your side
• Duel personalities?
• Us and them, maybe
• Traditional battlers
• Grendel and Beowulf
• Adver-saries
• They don't get along
• Hostile parties