The Treeman can use his immense bulk and robust limbs to smash things that would resist any other weapons. Any Treeman in hand-to-hand combat with a war machine, wagon, chariot, howdah or similar device can choose to whack the structure itself instead of making his usual attacks. The Treeman forgoes his normal attacks and instead makes a single Strength 10 whack at the structure; a successful hit inflicts D6 wounds on the structure with absolutely no save possible! These wounds only apply to the structure, not to the crew, escorts or creatures pulling it.