Possible Clues:

• Member of an irregular armed force
• It sounds a beastly form of warfare
• Member of a small independent armed force
• Argue violently about evil fighter
• By the sound of it a primate is fighting, but not as a regular
• Insurgent who works through sabotage and harassment
• Freedom fighter
• Sounds as if one might fight in a less than human way
• Argue angrily about sick partisan
• One's fighting to sound like 23 down