The Prince had his head-quarters at Delft and at Rotterdam. Between those two cities, an important fortress, called Polderwaert, secured him in the control of the alluvial quadrangle, watered on two sides by the Yssel and the Meuse. On the 29th June, the Spaniards, feeling its value, had made an unsuccessful effort to carry this fort by storm. They had been beaten off, with the loss of several hundred men, the Prince remaining in possession of the position, from which alone he could hope to relieve Leyden. He still held in his hand the keys with which he could unlock the ocean gates and let the waters in upon the land, and he had long been convinced that nothing could save the city but to break the dykes. Leyden was not upon the sea, but he could send the sea to. Leyden, although an army fit to encounter the besieging force under Valdez could not be levied. The battle of Mookerheyde had, for the present, quite settled the question, of land relief, but it was possible to besiege the besiegers, with the waves of the ocean. The Spaniards occupied the coast from the Hague to Vlaardingen, but the dykes along the Meuse and Yssel were in possession of the Prince. He determined, that these should be pierced, while, at the same time, the great sluices at Rotterdam, Schiedam, and Delftshaven should be opened. The damage to the fields, villages, and growing crops would be enormous, but he felt that no other course could rescue Leyden, and with it the whole of Holland from destruction. His clear expositions and impassioned eloquence at last overcame all resistance. By the middle of July the estates consented to his plan, and its execution was immediately undertaken. "Better a drowned land than a lost land," cried the patriots, with enthusiasm, as they devoted their fertile fields to desolation. The enterprise for restoring their territory, for a season, to the waves, from which it had been so patiently rescued, was conducted with as much regularity as if it had been a profitable undertaking. A capital was formally subscribed, for which a certain number of bonds were issued, payable at a long date. In addition to this preliminary fund, a monthly allowance of forty-five guldens was voted by the estates, until the work should be completed, and a large sum was contributed by the ladies of the land, who freely furnished their plate, jewellery, and costly furniture to the furtherance of the scheme.
Meantime, Valdez, on the 30th July; issued most urgent and ample offers of pardon to the citizens, if they would consent to open their gates and accept the King's authority, but his Overtures were received with silent contempt, notwithstanding that the population was already approaching the starvation point. Although not yet fully informed of the active measures taken by the Prince, yet they still chose to rely upon his energy and their own fortitude, rather than upon the honied words which had formerly been heard at the gates of Harlem and of Naarden. On the 3rd of August, the Prince; accompanied by Paul Buys, chief of the commission appointed to execute the enterprise, went in person along the Yssel; as far as Kappelle, and superintended the rupture of the dykes in sixteen places. The gates at Schiedam and Rotterdam were, opened, and the ocean began to pour over the land. While waiting for the waters to rise, provisions were rapidly, collected, according to an edict of the Prince, in all the principal towns of the neighbourhood, and some two hundred vessels, of various sizes, had also been got ready at Rotterdam, Delftshaven, and other ports.
The citizens of Leyden were, however, already becoming impatient, for their bread was gone, and of its substitute malt cake, they had but slender provision. On the 12th of August they received a letter from the Prince, encouraging them to resistance, and assuring them of a speedy relief, and on the 21st they addressed a despatch to him in reply, stating that they had now fulfilled their original promise, for they had held out two months with food, and another month without food. If not soon assisted, human strength could do no more; their malt cake would last but four days, and after that was gone, there was nothing left but starvation. Upon the same day, however, they received a letter, dictated by the Prince, who now lay in bed at Rotterdam with a violent fever, assuring them that the dykes were all pierced, and that the water was rising upon the "Land-Scheiding," the great outer barrier which separated the city from the sea. He said nothing however of his own illness, which would have cast a deep shadow over the joy which now broke forth among the burghers.
The letter was read publicly in the market-place, and to increase the cheerfulness, burgomaster Van der Werf, knowing the sensibility of his countrymen to music, ordered the city musicians to perambulate the streets, playing lively melodies and martial airs. Salvos of cannon were likewise fired, and the starving city for a brief space put on the aspect of a holiday, much to the astonishment of the besieging forces, who were not yet aware of the Prince's efforts. They perceived very soon, however, as the water everywhere about Leyden had risen to the depth of ten inches, that they stood in a perilous position. It was no trifling danger to be thus attacked by the waves of the ocean, which seemed about to obey with docility the command of William the Silent. Valdez became anxious and uncomfortable at the strange aspect of affairs, for the besieging army was now in its turn beleaguered, and by a stronger power than man's. He consulted with the most experienced of his officers, with the country people, with the most distinguished among the Glippers, and derived encouragement from their views concerning the Prince's plan. They pronounced it utterly futile and hopeless: The Glippers knew the country well, and ridiculed the desperate project in unmeasured terms.
Even in the city itself, a dull distrust had succeeded to the first vivid gleam of hope, while the few royalists among the population boldly taunted their fellow-citizens to their faces with the absurd vision of relief which they had so fondly welcomed. "Go up to the tower, ye Beggars," was the frequent and taunting cry, "go up to the tower, and tell us if ye can see the ocean coming over the dry land to your relief"—and day after day they did go, up to the ancient tower of Hengist, with heavy heart and anxious eye, watching, hoping, praying, fearing, and at last almost despairing of relief by God or man. On the 27th they addressed a desponding letter to the estates, complaining that the city had been forgotten in, its utmost need, and on the same day a prompt and warm-hearted reply was received, in which the citizens were assured that every human effort was to be made for their relief. "Rather," said the estates, "will we see our whole land and all our possessions perish in the waves, than forsake thee, Leyden. We know full well, moreover, that with Leyden, all Holland must perish also." They excused themselves for not having more frequently written, upon the ground that the whole management of the measures for their relief had been entrusted to the Prince, by whom alone all the details had been administered, and all the correspondence conducted.
The fever of the Prince had, meanwhile, reached its height. He lay at Rotterdam, utterly prostrate in body, and with mind agitated nearly to delirium, by the perpetual and almost unassisted schemes which he was constructing. Relief, not only for Leyden, but for the whole country, now apparently sinking into the abyss, was the vision which he pursued as he tossed upon his restless couch. Never was illness more unseasonable. His attendants were in despair, for it was necessary that his mind should for a time be spared the agitation of business. The physicians who attended him agreed, as to his disorder, only in this, that it was the result of mental fatigue and melancholy, and could be cured only by removing all distressing and perplexing subjects from his thoughts, but all the physicians in the world could not have succeeded in turning his attention for an instant from the great cause of his country. Leyden lay, as it were, anxious and despairing at his feet, and it was impossible for him to close his ears to her cry. Therefore, from his sick bed he continued to dictate; words of counsel and encouragement to the city; to Admiral Boisot, commanding, the fleet, minute directions and precautions. Towards the end of August a vague report had found its way into his sick chamber that Leyden had fallen, and although he refused to credit the tale, yet it served to harass his mind, and to heighten fever. Cornelius Van Mierop, Receiver General of Holland, had occasion to visit him at Rotterdam, and strange to relate, found the house almost deserted. Penetrating, unattended, to the Prince's bed-chamber, he found him lying quite alone. Inquiring what had become, of all his attendants, he was answered by the Prince, in a very feeble voice, that he had sent them all away. The Receiver-General seems, from this, to have rather hastily arrived at the conclusion that the Prince's disorder was the pest, and that his servants and friends had all deserted him from cowardice.
This was very far from being the case. His private secretary and his maitre d'hotel watched, day and night, by his couch, and the best physicians of the city were in constant attendance. By a singular accident; all had been despatched on different errands, at the express desire of their master, but there had never been a suspicion that his disorder was the pest, or pestilential. Nerves of steel, and a frame of adamant could alone have resisted the constant anxiety and the consuming fatigue to which he had so long been exposed. His illness had been aggravated by the rumor of Leyden's fall, a fiction which Cornelius Mierop was now enabled flatly to contradict. The Prince began to mend from that hour. By the end of the first week of September, he wrote along letter to his brother, assuring him of his convalescence, and expressing, as usual; a calm confidence in the divine decrees—"God will ordain for me," said he, "all which is necessary for my good and my salvation. He will load me with no more afflictions than the fragility of this nature can sustain."
The preparations for the relief of Leyden, which, notwithstanding his exertions, had grown slack during his sickness, were now vigorously resumed. On the 1st of September, Admiral Boisot arrived out of Zealand with a small number of vessels, and with eight hundred veteran sailors. A wild and ferocious crew were those eight hundred Zealanders. Scarred, hacked, and even maimed, in the unceasing conflicts in which their lives had passed; wearing crescents in their caps, with the inscription, "Rather Turkish than Popish;" renowned far and wide, as much for their ferocity as for their nautical skill; the appearance of these wildest of the "Sea-beggars" was both eccentric and terrific. They were known never to give nor to take quarter, for they went to mortal combat only, and had sworn to spare neither noble nor simple, neither king, kaiser, nor pope, should they fall into their power.
More than two hundred-vessels had been assembled, carrying generally ten pieces of cannon, with from ten to eighteen oars, and manned with twenty-five hundred veterans, experienced both on land and water. The work was now undertaken in earnest. The distance from Leyden to the outer dyke, over whose ruins the ocean had already been admitted, was nearly fifteen miles. This reclaimed territory, however, was not maintained against the sea by these external barriers alone. The flotilla made its way with ease to the Land-Scheiding, a strong dyke within five miles of Leyden, but here its progress was arrested. The approach to the city was surrounded by many strong ramparts, one within the other, by which it was defended against its ancient enemy, the ocean, precisely like the circumvallations by means of which it was now assailed by its more recent enemy, the Spaniard. To enable the fleet, however, to sail over the land; it was necessary to break through this two fold series of defences. Between the Land-Scheiding and Leyden were several dykes, which kept out the water; upon the level, were many villages, together with a chain of sixty-two forts, which completely occupied the land. All these Villages and fortresses were held by the veteran, troops of the King; the besieging force, being about four times as strong as that which was coming to the rescue.
The Prince had given orders that the Land-Scheiding, which was still one-and-a-half foot above water, should be taken possession of; at every hazard. On the night of the 10th and 11th of September this was accomplished; by surprise; and in a masterly manner. The few Spaniards who had been stationed upon the dyke were all, despatched or driven off, and the patriots fortified themselves upon it, without the loss of a man. As the day dawned the Spaniards saw the fatal error which they had committed in leaving thus bulwark so feebly defended, and from two villages which stood close to the dyke, the troops now rushed inconsiderable force to recover what they had lost. A hot action succeeded, but the patriots had too securely established themselves. They completely defeated the enemy, who retired, leaving hundreds of dead on the field, and the patriots in complete possession of the Land-scheiding. This first action was sanguinary and desperate. It gave a earnest of what these people, who came to relieve; their brethren, by sacrificing their property and their lives; were determined to effect. It gave a revolting proof, too, of the intense hatred which nerved their arms. A Zealander; having struck down a Spaniard on the dyke, knelt on his bleeding enemy, tore his heart from his bosom; fastened his teeth in it for an instant, and then threw it to a dog, with the exclamation, "'Tis too bitter." The Spanish heart was, however, rescued, and kept for years, with the marks of the soldier's teeth upon it, a sad testimonial of the ferocity engendered by this war for national existence.