Their efforts were chiefly directed against two points, namely that of San Engracia, which may be denominated the left attack, and that of Saint Augustin and Saint Monica which constituted the right attack. At San Engracia they laboured on a line perpendicular to the Cosso, from which they were only separated by the large convent of the Daughters of Jerusalem, and by the hospital for madmen, which was entrenched, although in ruins since the first siege. The line of this attack was protected on the left by the convent of the Capuchins, which La Coste had fortified to repel the counter assaults of the Spaniards. The right attack was more diffused, because the localities presented less prominent features to determine the direction of the approaches; and the French having mounted a number of light six-inch mortars, on peculiar carriages, drew them from street to street, and house to house, as occasion offered. On the other hand the Spaniards continually plied their enemies with hand grenades, which seem to have produced a surprising effect, and in this manner the never-ceasing combat was prolonged until the 7th of February, when the besiegers, by dint of alternate mines and assaults, had worked their perilous way at either attack to the Cosso, but not without several changes of fortune and considerable loss. They were, however, unable to obtain a footing on that public walk, for the Spaniards still disputed every house with undiminished resolution. Meanwhile, Lasnes having caused trenches to be opened on the left bank of the Ebro, a battery of twenty guns played against an isolated structure called the Convent of Jesus, which covered the right of the suburb line. On the 7th of February this convent was carried by storm, and with so little difficulty that the French, supposing the Spaniards to be panic stricken, assailed the suburb itself, but were quickly driven back with loss; they, however, made good their lodgement in the convent. On the town side the 8th, 9th, and 10th were wasted by the besiegers in vain attempts to pass the Cosso; they then extended their flanks. On the right with a view to reach the quay, and so connect this attack with that against the suburb, and on the left to obtain possession of the large and strongly built convent of Saint Francisco, in which after exploding an immense mine and making two assaults they finally established themselves. The 11th and 12th, mines were worked under the university, a large building on the Spanish side of the Cosso, in the line of the right attack; but their play was insufficient to open the walls, and the storming party was beaten, with the loss of fifty men. Nevertheless, the besiegers continuing their labours during the 13th, 14th, 15th, 16th, and 17th, passed the Cosso by means of traverses, and prepared fresh mines under the university, but deferred their explosion until a simultaneous effort could be combined on the side of the suburb.