The Helepolis bore a fearsome complement of heavy armaments, with two 180-pound (82 kg) catapults, and one 60-pounder (27 kg) (classified by the weight of the projectiles they threw) on the first floor, three 60-pounders (27 kg) on the second, and two 30-pounders (14 kg) on each of the next five floors. Apertures, shielded by mechanically adjustable shutters, lined with skins stuffed with wool and seaweed to render them fireproof, perforated the forward wall of the tower for firing the missile weapons. On each of the top two floors, soldiers could use two light dart throwers to easily clear the walls of defenders.