The Heeat family soldiers there had never experienced the dread of a catapult, and so with the legionaries beginning to throw out volley after volley of the weapon, coordinated closely with crossbow fire to protect these siege engines from opposing arrow fire, the men on the ramparts found it incredibly hard to even lift their heads over the wooden walls.
They could only duck and pray from behind that the walls held until reinforcements arrived because everybody could tell with a swear in their heart that the rickety palisade was not robust enough to hold against such a lethal onslaught for any appreciable length of time.
And this thought was quickly proved by quite a few unlucky instances when some parts of the wall could not hold, simply snapping away at the hit, and letting the stone bulldoze through to hit its unfortunate destined target.