They were silent, and after about a quarter of an hour Jack declared that he had counted four separate operations. He sent for one of the more experienced miners, and asked him to count independently. The man confirmed his opinion, adding that he thought there would be no danger of explosions from the French side for a day or two.

The rest of that day passed quietly. But early next morning the necessity of maintaining adequate guards at the exposed points of his position was brought home to Jack. During the night a large number of French had been silently posted in the ruined house at the end of the lane to the north of the Casa Vega. Issuing from these ruins, almost as soon as day dawned, they rushed towards the barricade, bearing fascines and scaling-ladders. But Don Cristobal, who was in command at this point, proved equal to the occasion. He sent off a messenger to Jack in the Casa Alvarez as soon as he saw signs of the French movement, and with the thirty resolute men of his command he held the enemy off, showing much coolness in awaiting their onset and ordering his men to fire at the right moment. When Jack came up at the head of a considerable reinforcement, the French were decisively driven off, leaving more than a score of dead behind them. They retired in confusion, some going into the ruins from which the attack had been made, others retreating down the street until they found protection from the Spaniards' musketry at the sharp bend in the roadway.

Hastening then to the Casa Vallejo, Jack found that the sounds of miners at work had been steadily growing more distinct. It was clearly time to prepare his own mine. The gallery extended some six feet beneath the floor of the ruined house adjoining. A heavy charge was laid in it; then the mine was tamped as quickly as possible. All was now in readiness. Through that day Jack scarcely left the place for a moment. It was of the utmost importance that the time for exploding the mine should be well chosen. He dared not run the risk of allowing the French to drive the heads of their tunnels past his own, for indeed they might not pass it, but come clean upon it, in which case they would either explode it themselves, or more probably withdraw the charge. His object was to allow them to approach as near as seemed safe, and then to fire the train. After an anxious day he retired to rest, convinced that a sharp conflict could no longer be much delayed.

At ten o'clock next morning, the 8th of February, he judged that the French miners could only be a few feet distant. Withdrawing all his men from the Casa Vallejo to the Casa Hontanon, next door, he waited tensely for a few minutes, then himself fired the train. There was a thunderous explosion, the walls of the room in which he was seemed to rock, then came the crash of falling beams, followed by a death-like silence. The mine had done its terrible work effectually; for the rest of the day there was no further sound of the French.

Meanwhile, on the other side of the Ebro the French were gradually preparing for a grand assault. The part of the city along the river bank had been hitherto little damaged, for it was protected by the transpontine suburb of San Lazaro, and to some extent by a few gun-boats moored near the bridge. The key to the position was the Jesus Convent, a building of bricks, with a ditch on the French side of it. The French batteries had made large breaches in its masonry, but in order to carry it by storm it was first necessary for the enemy to trench their way towards it by slow degrees, every step having to be taken under fire from the walls. Their work was delayed for a time by a sudden rise of the river inundating their trenches and driving them back for several hundred yards—a flood hailed with joy by the defenders, who regarded it as another miraculous interposition on the part of Our Lady of the Pillar.

Their condition was becoming pitiful in the extreme. All fresh meat and vegetables were exhausted; they had nothing now to subsist on but fish and salt meat. The few chickens that could be got each sold for a sum equivalent to an English pound. The French had seized all the water-mills along the banks of the river, so that the corn, of which the Spaniards yet possessed large stores, could not be ground, and they were forced to make a rough unwholesome bread of grain merely crushed or bruised. Fever, bred in the damp vaults in which most of the people lived, was carrying off hundreds every day; yet the emaciated survivors scarcely murmured, and the faintest suggestion of surrender was still sufficient to carry a man to the gibbet. Cheered by their brave untiring priests, they hoped against hope that relief would come.

But the floods subsided, and there was no sign of the long-expected succour. On the morning of February 8th, twenty-two French guns opened fire on the convent. Within a few hours the outer walls were battered down; then Marshal Lannes in person ordered the place to be carried by assault. Five hundred men instantly sprang from the trenches. The Spaniards in the convent, mingled regulars and monks, made what resistance they could, but they were unnerved by the preceding cannonade, and before the furious rush of the French grenadiers they fled and left the convent to its fate. Within the walls the French found hundreds of wounded and sick, and in the courtyard there were some two hundred corpses, men, women, and children, piled up awaiting burial. Even the French were sick at heart when they saw on these pale cold faces the terrible signs of fasting and disease. They themselves had suffered in their trenches. Among them too men fell fast; and even in their ranks there were heard murmurs against the long waiting of this cruel siege.

But though they had gained possession of the convent, their capture of the whole suburb was to be delayed for yet a few days. News was brought in to the French marshal, from his outlying positions, that a Spanish army was marching towards the city. The captain-general's brother, Francisco Palafox, had succeeded in raising a small force of 4000 men, and was now but twenty miles away. The attack could not be pressed in this quarter until the exact strength of the new enemy was ascertained. Marshal Lannes himself, therefore, drew off with 12,000 men, and once more the hopes of the dwindling garrison within the walls flickered up into the semblance of a flame.

Meanwhile Jack, in his little district, had become convinced that the defence could not be maintained for many more days. But he was determined to hold his own to the very end. After his explosion beyond the Casa Vallejo there had been a prolonged silence on the French side, but in the evening renewed sounds of mining in two quarters showed that though two of the four French galleries had been injured, the other two were still workable. It was only a matter of hours before the wall must fall. All that Jack could do was to ensure that the house should be held as long as possible after the explosion of the French mines, and that this should cause his men the minimum of loss. During the night of the 8th he built a fresh barricade between Vallejo and Tobar, some yards in the rear of the first one, leaving a means of ingress into the threatened house. On the roof of Tobar he stationed men, just before dawn, to give notice of any French movements in the ruins at the farther end of the block. Meanwhile the garrison of Vallejo were withdrawn behind the barricade, with orders to rush in and reoccupy the house as soon as the explosion had taken place.

At seven o'clock on the morning of the 9th a deep rumbling noise, as of a miniature earthquake, shook the quarter. Volumes of pungent smoke rolled along the lanes, and the crashing sounds proclaimed that the party-wall of Vallejo had fallen in.