But in this extremity relief at last was afforded by the decisive measures of the Prince of Orange, who ordered all the neighboring dikes to be opened and the sluices raised, thus sweeping away the besiegers on the waves of the ocean:  the inhabitants of Leyden were apprised of this intention by means of letters intrusted to the safe carriage of pigeons trained for the purpose.  The inundation was no sooner effected than hundreds of flat-bottomed boats brought abundance of supplies to the half-famished town; while a violent storm carried the sea across the country for twenty leagues around, and destroyed the Spanish camp, with above one thousand soldiers, who were overtaken by the flood.  This deliverance took place on the 3d of October, on which day it is still annually celebrated by the descendants of the grateful citizens.

It was now for the first time that Spain would consent to listen to advice or mediation, which had for its object the termination of this frightful war.  The emperor Maximilian II. renewed at this epoch his efforts with Philip; and under such favorable auspices conferences commenced at Breda, where the counts Swartzenberg and Hohenloe, brothers-in-law of the Prince of Orange, met, on the part of the emperor, the deputies from the king of Spain and the patriots; and hopes of a complete pacification were generally entertained.  But three months of deliberation proved their fallacy.  The patriots demanded toleration for the reformed religion.  The king’s deputies obstinately refused it.  The congress was therefore broken up; and both oppressors and oppressed resumed their arms with increased vigor and tenfold desperation.

Requesens had long fixed his eyes on Zealand as the scene of an expedition by which he hoped to repair the failure before Leyden; and he caused an attempt to be made on the town of Zuriczee, in the island of Scauwen, which merits record as one of the boldest and most original enterprises of the war.

The little islands of Zealand are separated from each other by narrow branches of the sea, which are fordable at low water; and it was by such a passage, two leagues in breadth, and till then untried, that the Spanish detachment of one thousand seven hundred and fifty men, under Ulloa and other veteran captains, advanced to their exploit in the midst of dangers greatly increased by a night of total darkness.  Each man carried round his neck two pounds of gunpowder, with a sufficient supply of biscuit for two days; and holding their swords and muskets high over their heads, they boldly waded forward, three abreast, in some places up to their shoulders in water.  The alarm was soon given; and a shower of balls was poured upon the gallant band, from upward of forty boats which the Zealanders sent rapidly toward the spot.  The only light afforded to either party was from the flashes of their guns; and while the adventurers advanced with undaunted firmness, their equally daring assailants, jumping from their boats into the water, attacked them with oars and hooked handspikes, by which many of the Spaniards were destroyed.  The rearguard, in this extremity, cut off from their companions, was obliged to retreat; but the rest, after a considerable loss, at length reached the land, and thus gained possession of the island, on the night of the 28th of September, 1575.