Cast a mount against thee: he shall draw a line round about thee, and build bastions, raise sconces to defend the lines, to keep in the besieged, and secure the besiegers; or he shall pour out the shot, mighty stones or the like, out of the engines framed and placed on the forts before mentioned; for so did they of old build mighty wooden towers, and there placed engines, out of which they could fling mighty stones or darts against the besieged, who were much annoyed from these high towers, overlooking their walls and streets that none could stir out.