Related Clues:

• Phases
• Flanks
• The Blue and the Gray, once
• Enemies
• They're not on your side
• Duel personalities?
• Slaw et al.
• Us and them, maybe
• Traditional battlers
• Grendel and Beowulf
• USC and UCLA, e.g.
• Ones in a contest
• Adver-saries
• They don't get along
• Order specifications