Imagine a fir-tree cut down, and set to turn round a horizontal axis on lofty uprights, but not in equilibrio; three-fourths of the tree being on the hither side. At the shorter and thicker end of the tree was fastened a weight of half a ton. This butt end just before the discharge pointed towards the enemy. By means of a powerful winch the long tapering portion of the tree was forced down to the very ground; and fastened by a bolt; and the stone placed in a sling attached to the tree's nose. But this process of course raised the butt end with its huge weight high in the air, and kept it there struggling in vain to come down. The bolt was now drawn; Gravity, an institution which flourished even then, resumed its sway, the short end swung furiously down, the long end went as furiously round up, and at its highest elevation flung the huge stone out of the sling with a tremendous jerk. In this case the huge mass so flung missed the knight, but came down near him on the penthouse, and went through it like paper, making an awful gap in roof and floor. Through the latter fell out two inanimate objects, the stone itself and the mangled body of a besieger it had struck. They fell down the high curtain side, down, down, and struck almost together the sullen waters of the moat, which closed bubbling on them, and kept both the stone and the bone two hundred years, till cannon mocked those oft perturbed waters, and civilization dried them. "Aha! a good shot," cried Baldwyn of Burgundy. The tall knight retired. The besiegers hooted him. He reappeared on the platform of the barbican, his helmet being just visible above the parapet. He seemed very busy, and soon an enormous Turkish catapult made its appearance on the platform, and aided by the elevation at which it was planted, flung a twenty-pound stone two hundred and forty yards in the air; it bounded after that, and knocked some dirt into the Lord Anthony's eye, and made him swear. The next stone struck a horse that was bringing up a sheaf of arrows in a cart, bowled the horse over dead like a rabbit, and spilt the cart. It was then turned at the besiegers' wooden tower, supposed to be out of shot. Sir Turk slung stones cut with sharp edges on purpose, and struck it repeatedly, and broke it in several places. The besiegers turned two of their slinging engines on this monster, and kept constantly slinging smaller stones on to the platform of the barbican, and killed two of the engineers. But the Turk disdained to retort. He flung a forty-pound stone on to the besiegers' great catapult, and hitting it in the neighbourhood of the axis, knocked the whole structure to pieces and sent the engineers skipping and yelling.