Amid these delays the winter expired, and scarcely had the ice begun to disappear when the construction of the bridge of boats was actively resumed by the besiegers. Between the two piers a space of more than six hundred paces still remained to be filled up, which was effected in the following manner: Thirty-two flat-bottomed vessels, each sixty-six feet long and twenty broad, were fastened together with strong cables and iron chains, but at a distance from each other of about twenty feet to allow a free passage to the stream. Each boat, moreover, was moored with two cables, both up and down the stream, but which, as the water rose with the tide, or sunk with the ebb, could be slackened or tightened. Upon the boats great masts were laid which reached from one to another, and, being covered with planks, formed a regular road, which, like that along the piers, was protected with a balustrade. This bridge of boats, of which the two piers formed a continuation, had, including the latter, a length of twenty-four thousand paces. This formidable work was so ingeniously constructed, and so richly furnished with the instruments of destruction, that it seemed almost capable, like a living creature, of defending itself at the word of command, scattering death among all who approached. Besides the two forts of St. Maria and St. Philip, which terminated the bridge on either shore, and the two wooden bastions on the bridge itself, which were filled with soldiers and mounted with guns on all sides, each of the two-and-thirty vessels was manned with thirty soldiers and four sailors, and showed the cannon's mouth to the enemy, whether he carne up from Zealand or down from Antwerp. There were in all ninety-seven cannon, which were distributed beneath and above the bridge, and more than fifteen hundred men who were posted, partly in the forts, partly in the vessels, and, in case of necessity, could maintain a terrible fire of small-arms upon the enemy.