Parma had from the first seen that it was absolutely impossible to drive piles across the deep water between the piers, and had prepared to connect them with a bridge of boats. For this purpose he had constructed thirty-two great barges, each sixty-two feet in length, and twelve in breadth. These were moored in pairs with massive chains and anchors, the distance between each pair being twenty-two feet. All were bound together with chains and timbers and a roadway protected by a parapet of massive beams was formed across it. Each boat was turned into a fortress by the erection of solid wooden redoubts at each end, mounting heavy guns, and was manned by thirty-two soldiers and four sailors. The forts at the end of the bridge each mounted ten great guns, and twenty armed vessels with heavy pieces of artillery were moored in front of each fort. Thus the structure was defended by 170 great guns.

As an additional protection to the bridge, two heavy rafts, each 1250 feet long, composed of empty barrels, heavy timbers, ships' masts, and woodwork bound solidly together, were moored at some little distance above and below the bridge of boats. These rafts were protected by projecting beams of wood tipped with iron, to catch any vessels floating down upon them. The erection of this structure was one of the most remarkable military enterprises ever carried out.

Now that it was too late the people of Antwerp bitterly bewailed their past folly, which had permitted an enterprise that could at any moment have been interrupted to be carried to a successful issue.

But if something like despair seized the citizens at the sight of the obstacle that cut them off from all hope of succour, the feelings of the great general whose enterprise and ability had carried out the work were almost as depressed. His troops had dwindled to the mere shadow of an army, the cavalry had nearly disappeared, the garrisons in the various cities were starving, and the burghers had no food either for the soldiers or themselves.

The troops were two years behindhand in their pay. Parma had long exhausted every means of credit, and his appeals to his sovereign for money met with no response. But while in his letters to Philip he showed the feelings of despair which possessed him, he kept a smiling countenance to all else. A spy having been captured, he ordered him to be conducted over every part of the encampment. The forts and bridge were shown to him, and he was requested to count the pieces of artillery, and was then sent back to the town to inform the citizens of what he had seen.

At this moment Brussels, which had long been besieged, was starved into surrender, and Parma was reinforced by the troops who had been engaged in the siege of that city. A misfortune now befell him similar to that which the patriots had suffered at Bois le Duc. He had experienced great inconvenience from not possessing a port on the sea coast of Flanders, and consented to a proposal of La Motte, one of the most experienced of the Walloon generals, to surprise Ostend. On the night of the 29th of March, La Motte, with 2000 foot and 1200 cavalry, surprised and carried the old port of the town. Leaving an officer in charge of the position, he went back to bring up the rest of his force. In his absence the soldiers scattered to plunder. The citizens roused themselves, killed many of them, and put the rest to flight, and by the time La Motte returned with the fresh troops the panic had become so general that the enterprise had to be abandoned.

The people of Antwerp now felt that unless some decisive steps were taken their fate was sealed. A number of armed vessels sailed up from Zeeland, and, assisted by a detachment from Fort Lillo, suddenly attacked and carried Fort Liefkenshoek, which had been taken from them at the commencement of the siege, and also Fort St. Anthony lower down the river. In advancing towards the latter fort they disobeyed Sainte Aldegonde's express orders, which were that they should, after capturing Liefkenshoek, at once follow the dyke up the river to the point where it was broken near the fort at the end of the bridge, and should there instantly throw up strong works.

Had they followed out these orders they could from this point have battered the bridge, and destroyed this barrier over the river. But the delay caused by the attack on the Fort St. Anthony was fatal, for at night Parma sent a strong body of soldiers and sappers in boats from Kalloo to the broken end of the dyke, and these before morning threw up works upon the very spot where Sainte Aldegonde had intended the battery for the destruction of the bridge to be erected. Nevertheless the success was a considerable one. The possession of Lillo and Liefkenshoek restored to the patriots the command of the river to within three miles of the bridge, and enabled the Zeeland fleet to be brought up at that point.

Another blow was now meditated. There was in Antwerp an Italian named Gianobelli, a man of great science and inventive power. He had first gone to Spain to offer his inventions to Philip, but had met with such insolent neglect there that he had betaken himself in a rage to Flanders, swearing that the Spaniards should repent their treatment of him. He had laid his plans before the Council of Antwerp, and had asked from them three ships of a hundred and fifty, three hundred and fifty, and five hundred tons respectively, besides these he wanted sixty flat bottomed scows. Had this request been complied with it is certain that Parma's bridge would have been utterly destroyed; but the leading men were building a great ship or floating castle of their own design, from which they expected such great things that they christened it the End of the War. Gianobelli had warned them that this ship would certainly turn out a failure. However, they persisted, and instead of granting him the ships he wanted, only gave him two small vessels of seventy and eighty tons.

Although disgusted with their parsimony on so momentous an occasion, Gianobelli set to work with the aid of two skilful artisans of Antwerp to fit them up.