Suddenly a gun boomed out from the archduke's camp as a signal to Bucquoy, and just as the night had fairly set in the besiegers rushed to the assault from all points. They were received by a tremendous fire from the guns of the forts and the muskets of the soldiers; but, although the effect was serious, they did not hesitate a moment, but dashed forwards towards the foot of the sand-hill and the wall of the old town, halted for a moment, poured in a volley, and then rushed into the breach and against the walls. The volley had been harmless, for Vere had ordered the men to lie flat until it was given. As the Spaniards climbed up barrels of ashes were emptied upon them, stones and heavy timbers hurled down, and flaming hoops cast over their necks. Three times they climbed to the crest of the sand-hill, and as many times gained a footing on the Schottenburg; but each time they were beaten back with great slaughter. As fiercely did they attack at the other points, but were everywhere repulsed. On the east side three strong battalions of the enemy attacked the outwork across the Geule, known as the Spanish Half-moon. Vere, who was everywhere supervising the defence, ordered the weak garrison there to withdraw, and sent a soldier out to give himself up, and to tell them that the Half-moon was slenderly manned, and to offer to lead them in. The offer was accepted, and the Spaniards took possession of the work. The general's object was to occupy them, and prevent their supporting their comrades in the western attack. The Half-moon, indeed, was quite open towards the town. Tide was rising, and a heavy fire was opened upon the captors of the work from the batteries across the Geule, and they were driven out with the loss of three hundred men. At length the assault was repulsed at all points, and the assailants began to retire across the Old Haven. No sooner did they begin to ford it than Vere opened the west sluice, and the water in the town ditch rushed down in a torrent, carrying numbers of the Spaniards away into the sea. Altogether, the assault cost the Spaniards two thousand men. An enormous amount of plunder in arms, gold chains, jewels, and rich garments were obtained by the defenders from the bodies of the fallen. The loss of the garrison was only thirty killed and a hundred wounded. The repulse of the grand attack upon Ostend by no means put an end to the siege. Sir Francis Vere, his brother Horace, Sir John Ogle, and Sir Lionel Vickars left, the general being summoned to assume command in the field; but the siege continued for two years and a half longer. Many assaults were repulsed during that time, and the town only surrendered on the 20th September, 1604, when the sand-hill, which was the key of the whole position, was at last captured by the Spaniards.