The prince, although justly irritated by their folly in neglecting to carry out his orders, sent a message by a pigeon to them, encouraging them to hold out, and reminding them that the fate of their country depended upon the issue of this siege. He implored them to hold out for at least three months, assuring them that he would within that time devise means for their deliverance. The citizens replied, assuring the prince of their firm confidence in their own fortitude and his exertions. On the 6th of June the Grand Commander issued what was called a pardon, signed and sealed by the king. In it he invited all his erring and repentant subjects to return to his arms, and accept a full forgiveness for their past offense upon the sole condition that they should once more enter the Catholic Church. A few individuals mentioned by name were alone excluded from this amnesty. But all Holland was now Protestant, and its inhabitants were resolved that they must not only be conquered but annihilated before the Roman Church should be re-established on their soil. In the whole province but two men came forward to take advantage of the amnesty. Many Netherlanders belonging to the king's party sent letters from the camp to their acquaintances in the city exhorting them to submission, and imploring them "to take pity upon their poor old fathers, their daughters, and their wives;" but the citizens of Leyden thought the best they could do for these relatives was to keep them out of the clutches of the Spaniards. At the commencement of the siege the citizens gathered all their food into the magazines, and at the end of June the daily allowance to each full grown man was half a pound of meat and half a pound of bread, women and children receiving less. The prince had his headquarters at Delft and Rotterdam, and an important fortress called the Polderwaert between these two cities secured him the control of the district watered by the rivers Yssel and Maas. On the 29th of June the Spaniards attacked this fort, but were beaten off with a loss of 700 men. The prince was now occupied in endeavouring to persuade the Dutch authorities to permit the great sluices at Rotterdam, Schiedam, and Delft Haven to be opened. The damage to the country would be enormous; but there was no other course to rescue Leyden, and with it the whole of Holland, from destruction.