It was difficult, therefore, for Daniel to make any sense of the project underway northeast of London. Over several weeks Daniel watched a flat parade-ground develop pits and wrinkles, which slowly grew to ditches and mounds, and shaped and resolved themselves (as if he were adjusting the focus of a prospective glass) into sharp neat earthworks. Daniel had never seen such things because, until now, they had not been built in England, but from books and siege-paintings he knew them as ramparts, a bastion, ravelins, and a demilune work. But if this were a preparation for Dutch invasion, it was poorly thought out, because these works stood in isolation, protecting nothing save a pasture with a few dozen befuddled, but extremely well-defended, cows. Nevertheless, guns were mustered out from the Ordnance storehouses in the Tower, and hauled up onto the ramparts by teams of straining oxen – hernias with legs. The cracks of the teamsters' whips and the snorts and bellows of the beasts were carried for miles on a sea breeze all the way across Houndsditch and over the Wall and up the pitched roof of Gresham's College into Daniel's ears. Daniel for his part only stared in amaze.