It was a black and desolate scene. The wild waves of the German ocean, lashed by the wintry gales, would often sweep over the painfully constructed works of besieger and besieged and destroy in an hour the labour of many weeks. The Porcupine's small but vitally-important ravelin lying out in the counterscarp between the old town and the new, guarding the sluices by which the water for the town moats and canals was controlled, and preventing the pioneers of the enemy from undermining the western wall--was so damaged by the sea as to be growing almost untenable. Indefatigably had the besieged attempted with wicker-work and timber and palisades to strengthen this precious little fort, but they had found, even as Bucquoy and the archduke on their part had learned, that the North Sea in winter was not to be dammed by bulrushes. Moreover, in a bold and successful assault the besiegers had succeeded in setting fire to the inflammable materials heaped about the ravelin to such effect that the fire burned for days, notwithstanding the flooding of the works at each high tide. The men, working day and night, scorching in the flames, yet freezing kneedeep in the icy slush of the trenches and perpetually under fire of the hostile batteries, became daily more and more exhausted, notwithstanding their determination to hold the place. Christmas drew nigh, and a most gloomy, festival it was like to be, for it seemed as if the beleaguered garrison had been forgotten by the States. Weeks had passed away without a single company being sent to repair the hideous gaps made daily in the ranks of those defenders of a forlorn hope. It was no longer possible to hold the external works; the Square, the Polder, and the other forts on the southwest which Vere had constructed with so much care and where he had thus far kept his headquarters. On Sunday morning,--23rd December, he reluctantly gave orders that they should be abandoned on the following day and the whole garrison concentrated within the town.