Related Clues:

• Armed adversary
• Objectors
• Legions of legions
• Military adversary
• Opposing teams
• Scipio, to Hannibal
• Military opponent
• The Riddler, to Batman
• Battling factions
• Hostile bunch
• They're opposed
• They're not behind you
• The North and the South, in the Civil War
• Achilles and Hector
• General assemblies?