While waiting for the water to rise, stores of provisions were collected in all the principal towns, and 200 vessels of small draught of water gathered in readiness. Unfortunately no sooner had the work been done than the prince was attacked by a violent fever, brought on by anxiety and exertion.

On the 21st of August a letter was received from the town saying that they had now fulfilled their original promise, for they had held out two months with food and another month without food. Their bread had long been gone, and their last food, some malt cake, would last but four days. After that was gone there was nothing left but starvation.

Upon the same day they received a letter from the prince, assuring them that the dykes were all pierced and the water rising upon the great dyke that separated the city from the sea. The letter was read publicly in the marketplace, and excited the liveliest joy among the inhabitants. Bands of music played in the streets, and salvos of cannon were fired. The Spaniards became uneasy at seeing the country beyond them gradually becoming covered with water, and consulted the country people and the royalists in their camp, all of whom assured them that the enterprise of the prince was an impossibility, and that the water would never reach the walls.