Quitman, with a select storming party from Twiggs’s division two hundred and fifty strong, commanded by Captain Casey and supported by Smith’s brigade, was to attack on the right, carrying the formidable position reconnoitred by him on the 12th, and thence sweeping up the hill to enter the citadel itself. Pillow, supported by Worth’s whole division with a select storming party from that division, headed by the gallant Captain McKensie, 2d artillery, was to break through the cypress grove, charge up the hill, and pour his men into the work in conjunction with Quitman.
At eight o’clock the commands advanced. In Pillow’s attack, the Voltigeurs, with Callender’s howitzer battery, ran forward, and, charging the wood, soon cleared it of the enemy’s skirmishers. His whole command now pushed forward with such unexpected vigor that, before the storming party could pass them to take the lead, the whole brow of the hill was covered by a dense body of men, who, finding cover behind rocks and in the inequalities of the ground, steadfastly maintained its position, swaying slightly in the effort to get better cover whilst endeavoring to advance. There they hung, like a cluster of bees, whilst a tremendous fire of artillery opened upon them from the work. The storming party with their ladders now pressed forward; soon they were planted, the gallant McKensie, with his hat on his sword, pressed forward, drawing after as by strings the whole command, who in a moment overleaped the work and drove the gunners down the eastern slope, where a fierce conflict still raged on the part of Quitman.
Quitman, at the preconcerted signal, moved forward the select storming party from Twiggs’s division, a light battalion under the gallant Major Twiggs, and a select storming party of forty marines under Captain Reynolds in the advance, followed by the Maine battalion, the South Carolina, New York, and Pennsylvania volunteers.
The brigade of Smith was in the adjoining field on the right, and had assigned to it the duty of breaking through the aqueduct and taking the enemy in flank and rear. The command moved up the causeway, under a tremendous fire of artillery and musketry, till they reached some old buildings of adobe, where they were obliged to get a momentary shelter. From this position, a company of the rifles and portions of the storming parties being still further in advance, they opened an effective fire in return. As the volunteer regiments came up, they were turned off into the open field on the left, intersected with ditches, to the assault of Chapultepec.
The New Yorkers and Pennsylvanians made a detour to the left, and entering the cypress grove at an abandoned breastwork where some fifteen minutes previously portions of Pillow’s command had entered, pressed forward and became intermingled with Pillow’s command as it poured into the work, as did the Palmettoes, who pierced the stone wall at a partial breach made by a cannon-ball without scarcely varying from their direction.
Smith in his advance, finding two wide and deep ditches in his front without any adequate means to cross them, and his force too small to force the passage in presence of the immense force of the enemy, veered to the left, and sheltering his troops partially by maguey plants, opened a well-directed fire upon the enemy in conjunction with the storming parties and marines on the causeway.
Meanwhile Drum’s battery, a 9-pounder and a 16-pounder, came up and opened on the enemy, as did Hunt’s section of Drum’s battery.
For half an hour the contest was of unparalleled severity. Our troops, however, pressed forward, and, Chapultepec having fallen, the enemy fled to the city along the Tacubaya causeway, and a causeway entering the San Cosme causeway at the English cemetery, some six hundred yards outside the garita, yet not till some of the most resolute of their troops had maintained their posts even to the interlocking of bayonets and clubbing of rifles.
Quitman on the Tacubaya causeway, the rifles and 1st artillery of Smith’s brigade in advance, Worth on the San Cosme causeway, pressed forward in pursuit of the enemy.
Aqueducts supplying the city with water extended along both these causeways, resting on arches that afforded partial shelter to troops. The causeway of Tacubaya led directly into the city, and with a strong field-work midway was defended at the gate by another formidable battery, by the strong work of the citadel three hundred yards distant, and by cross-fires from a formidable battery on the paseo leading from the San Cosme to the Belen suburb, and on both sides were almost impassable ditches filled with water.