In the old town, closer to the mouth of the old harbour, a fort called the "Sandhill" had been constructed. The old town was protected by strong palisades forming bastions with connecting curtains, and a succession of three small forts; the "Schottenburgh" (next to the "Sand-hill"), the "Moses Table", and the "Flamenburg" all defending a cut from the town ditch into the "Geule", at the eastern corner. On the eastern side of the town facing the "Geule", the defences consisted of a range of bulwarks (or bastions) "North Bulwark", "East Bulwark" or "Pekell", "Spanish Bulwark" at the southeast angle, with an outwork called the "Spanish Half-moon". To the South and West an extensive outwork, the "Polder", which had formerly been a field from which the water had been pumped by means of windmills near the point where the Yperlet stream flowed into the old harbour. Flanking the "Polder" at both points were the "South bulwark " and the "West bulwark", in front of each were two further outworks; the inner stronger Polder, South and West Bulwark's which then linked the Polder, South and West Ravelins. This then linked to the Polder, South and West square's; Ostend's most outer defensive works.