But while they were trying to prove the absurdity of the Prince of Parma's undertaking he had already completed it. As soon as the forts St. Maria and St. Philip were erected, and protected the workmen and the work by their fire, a pier was built out into the stream from both banks, for which purpose the masts of the largest vessels were employed; by a skilful arrangement of the timbers they contrived to give the whole such solidity that, as the result proved, it was able to resist the violent pressure of the ice. These timbers, which rested firmly and securely on the bottom of the river, and projected a considerable height above it, being covered with planks, afforded a commodious roadway. It was wide enough to allow eight men to cross abreast, and a balustrade that ran along it on both sides, protected them from the fire of small- arms from the enemy's vessels. This "stacade," as it was called, ran from the two opposite shores as far as the increasing depth and force of the stream allowed. It reduced the breadth of the river to about eleven hundred feet; as, however, the middle and proper current would not admit of such a barrier, there remained, therefore, between the two stacades a space of more than six hundred paces through which a whole fleet of transports could sail with ease. This intervening space the prince designed to close by a bridge of boats, for which purpose the craft must be procured from Dunkirk. But, besides that they could not be obtained in any number at that place, it would be difficult to bring them past Antwerp without great loss. He was, therefore, obliged to content himself for the time with having narrowed the stream one-half, and rendered the passage of the enemy's vessels so much the more difficult. Where the stacades terminated in the middle of the stream they spread out into parallelograms, which were mounted with heavy guns, and served as a kind of battery on the water. From these a heavy fire was opened on every vessel that attempted to pass through this narrow channel. Whole fleets, however, and single vessels still attempted and succeeded in passing this dangerous strait.