The town thus about to assume so much importance in the world's eye had about three thousand inhabitants within its lowly; thatch-roofed houses. It fronted directly upon the seacoast and stretched backward in a southerly direction, having the sandy downs on the right and left, and a swampy, spongy soil on the inner verge, where it communicated with the land. Its northern part, small and scarcely inhabited, was lashed by the ocean, and exposed to perpetual danger from its storms and flood-tides, but was partially protected from these encroachments by a dyke stretching along the coast on the west. Here had hitherto been the harbour formed by the mouth of the river Iperleda as it mingled with the sea, but this entrance had become so choked with sand as to be almost useless at low water. This circumstance would have rendered the labours of the archduke comparatively easy, and much discouraged the States, had there not fortunately been a new harbour which had formed itself on the eastern side exactly at the period of threatened danger. The dwarf mountain range of dunes which encircled the town on the eastern side had been purposely levelled, lest the higher summits should offer positions of vantage to a besieging foe. In consequence of this operation, the sea had burst over the land and swept completely around the place, almost converting it into an island, while at high water there opened a wide and profound gulf which with the ebb left an excellent channel quite deep enough for even the ships of war of those days. The next care of the States authorities was to pierce their fortifications on this side at a convenient point, thus creating a safe and snug haven within the walls for the fleets of transports which were soon to arrive by open sea, laden with soldiers and munitions. The whole place was about half an hour's walk in circumference. It was surrounded with a regular counterscarp, bastions, and casemates, while the proximity of the ocean and the humid nature of the soil ensured it a network of foss and canal on every side. On the left or western side, where the old harbour had once been, and which was the most vulnerable by nature, was a series of strong ravelins, the most conspicuous of which were called the Sand Hill, the Porcupine, and Hell's Mouth. Beyond these, towards the southwest, were some detached fortifications, resting for support, however, upon the place itself, called the Polder, the Square, and the South Square. On the east side, which was almost inaccessible, as it would seem, by such siege machinery as then existed, was a work called the Spanish half-moon, situate on the new harbour called the Guele or Gullet.