them, through the holes, strong ropes are fastened to hold the two parts together, and prevent them from starting asunder.
5. From these ropes thus placed a wooden pin rises in an oblique direction, like the pole of a chariot, and it is so fastened by knotted cords as to be raised or depressed at pleasure. To its top, iron hooks are fastened, from which a sling hangs, made of either cord or iron. Below the pin is a large sack filled with shreds of cloth, fastened by strong ties, and resting on heaped-up turves or mounds of brick. For an engine of this kind, if placed on a stone wall, would destroy whatever was beneath it, not by its weight, but by the violence of its concussion.
6. Then when a conflict begins, a round stone is placed on the sling, and four youths on each side, loosening the bar to which the cords are attached, bend the pin back till it points almost upright into the air; then the worker of the engine, standing by on high ground, frees by a blow with the heavy hammer the bolt which keeps down the whole engine; and the pin being set free by the stroke, and striking against the mass of cloth shreds, hurls forth the stone with such force as to crush whatever it strikes.
7. This engine is called a tormentum, because all its parts are twisted (torquetur); or a scorpion, because it has an erect sting; but modern times have given it the name of the wild-ass, because when wild asses are hunted, they throw the stones behind them by their kicks so as to pierce the chests of those who pursue them, or to fracture their skulls.
8. Now let us come to the battering ram. A lofty pine or ash is chosen, the top of which is armed with a long and hard head of iron, resembling a ram, which form has given the name to the engine. It is suspended from iron beams running across on each side, like the top of a pair of scales, and is kept in its place by ropes hanging from a third beam. A number of men draw it back as far as there is room, and then again drive it forward to break down whatever opposes it by mighty blows, like a ram which rises up and butts.
9. By the frequent blows of this rebounding thunderbolt, buildings are torn asunder and walls are loosened and thrown down. By this kind of engine, if worked with proper vigour, garrisons are deprived of their defences, and
