The right and centre columns arrived in front of the town that evening. The latter, after driving back the Spanish advanced guards, halted at a distance of a league from the Capuchin convent of the Trinity; the former took post on both sides of the Huerba, and, having seized the aqueduct by which the canal is carried over that river, proceeded, in pursuance of Napoleon’s orders, to raise batteries, and to make dispositions for an immediate assault on Monte Torrero. Meanwhile general Gazan, with the left column, marching by Cartejon and Zuera reached Villa Nueva, on the Gallego river, without encountering an enemy. [Sidenote: Cavalhero.] The Monte Torrero was defended by five thousand Spaniards, under the command of general St. Marc; but, at day-break on the 21st, the French opened their fire against the fort, and one column of infantry having attracted the attention of the Spaniards, a second, unseen, crossed the canal under the aqueduct, and, penetrating between the fort and the city, entered the former by the rear, and, at the same time, a third column stormed the works protecting the great sluices. These sudden attacks, and the loss of the fort, threw the Spaniards into confusion, and they hastily retired to the town, which so enraged the plebeian leaders that the life of St. Marc was with difficulty saved by Palafox. [Sidenote: Rogniat.] It had been concerted among the French that general Gazan should assault the suburb, simultaneously with the attack on the Torrero; and that officer, having encountered a body of Spanish and Swiss troops placed somewhat in advance, drove the former back so quickly that the Swiss, unable to make good their retreat, were, to the number of three or four hundred, killed or taken. But, notwithstanding this fortunate commencement, Gazan did not attack the suburb itself until after the affair at Monte Torrero was over, and then only upon a single point, and without any previous examination of the works. The Spaniards, recovering from their first alarm, soon reinforced this point, and Gazan was forced to desist, with the loss of four hundred men. This important failure more than balanced the success against the Monte Torrero. It restored the shaken confidence of the Spaniards at a most critical moment, and checking in the French, at the outset, that impetuous spirit, that impulse of victory, which great generals so carefully watch and improve, threw them back upon the tedious and chilling process of the engineer. The 24th of December the investment of Zaragoza was completed on both sides of the Ebro. General Gazan occupied the bridge over the Gallego with his left, and covered his front from sorties by inundations and cuts that the low, marshy plain where he was posted enabled him to make without difficulty. General Suchet occupied the space between the Upper Ebro and the Huerba. Morlot’s division of the 3d corps encamped in the broken hollow that formed the bed of that stream.