Possible Clues:

• They're very forceful leading the charge to chop up gorse, grass
• Gorse and grass running wild — they will become belligerent
• Hostile attackers
• They lead the attack on people chopping up gorse grass
• First strikers emerge from gorse tangled with grass
• Attackers are gross, gross with no heart, nasty
• A great grand rumpus (ending so soon, one rather suspects) — we started it