Until daylight the struggle continued, and Philip then ordered the whole of his force to advance to the assistance of the storming party. A tremendous attack was made upon the ravelin in front of the gate of the Cross. It was successful, and the Spaniards rushed exulting into the work, believing that the city was now at their mercy. Then, to their astonishment, they saw that they were confronted by the new wall, whose existence they had not even suspected. While they were hesitating a tremendous explosion took place. The citizens had undermined the ravelin and placed a store of powder there; and this was now fired, and the work flew into the air, with all the soldiers who had entered. The retreat was sounded at once, and the Spaniards fell back to their camp, and thus a second time the burghers of Haarlem repulsed an assault by an overwhelming force under the best generals of Spain. The effect of these failures was so great that Don Frederick resolved not to risk another defeat, but to abandon his efforts to capture the city by sap or assault, and to resort to the slow but sure process of famine. He was well aware that the stock of food in the city was but small and the inhabitants were already suffering severely, and he thought that they could not hold out much longer. But greatly as the inhabitants suffered, the misery of the army besieging them more than equalled their own. The intense cold rendered it next to impossible to supply so large a force with food; and small as were the rations of the inhabitants, they were at least as large and more regularly delivered than those of the troops. Moreover, the citizens who were not on duty could retire to their comfortable houses; while the besiegers had but tents to shelter them from the severity of the frosts. Cold and insufficient food brought with them a train of diseases, and great numbers of the soldiers died. The cessation of the assaults tried the besieged even more than their daily conflicts had done, for it is much harder to await death in a slow and tedious form than to face it fighting. They could not fully realize the almost hopeless prospect. Ere long the frost would break up, and with it the chance of obtaining supplies or reinforcements across the frozen lake would be at an end. It was here alone that they could expect succour, for they knew well enough that the prince could raise no army capable of cutting its way through the great beleaguering force. In vain did they attempt to provoke or anger the Spaniards into renewing their attacks. Sorties were constantly made. The citizens gathered on the walls, and with shouts and taunts of cowardice challenged the Spaniards to come on; they even went to the length of dressing themselves in the vestments of the churches, and contemptuously carrying the sacred vessels in procession, in hopes of infuriating the Spaniards into an attack. But Don Frederick and his generals were not to be moved from their purpose.