They had driven lines of piles into the bottom of the Ij to seal off the prongs of the U and prevent French or English warships from coming right up to the Damplatz. These piles supported a boardwalk that swung across the harbor in a flattened arc, with drawbridges here and there to let small boats – ferry kaags, Flemish pleyts, beetle-like water-ships, keg-shaped smakschips – into the inner harbor; the canals; and the Damrak, which was the short inlet that was all that remained of the original river Amstel. Larger ships were moored to the outside of this barrier. At the eastern end of the Inner Harbor, they'd made a new island called Oostenburg and put a shipyard there: over it flew a flag with small letters O and C impaled on the horns of a large V, which meant the Dutch East India Company. This was a wonder all by itself, with its ropewalks – skinny buildings a third of a mile long – windmills grinding lead and boring gun-barrels, a steam-house, perpetually obnubilated, for bending wood, dozens of smoking and clanging smithys including two mighty ones where anchors were made, and a small tidy one for making nails, a tar factory on its own wee island so that when it burnt down it wouldn't take the rest of the yard with it. A whole warehouse district of its own. Lofts big enough to make sails larger than any Jack had ever seen. And, of course, skeletons of several big ships on the slanted ways, braced with diagonal sticks to keep 'em from toppling over, and all aswarm with workers like ants on a whale's bones.