The advance then continued for some little distance, and, as the ammunition of our two heavy guns had been exhausted, the captured Mexican 8-pounder was made to do good service. But Santa Anna, who had thought the position safe and gone on to San Cosme, soon arrived with ordnance and troops. The citadel was reinforced, and infantry and cannon were placed at other points. Quitman's last artillery cartridges were used, and under the enemy's fire no more could be brought up. Solid shot cut down both Drum and Benjamin. Our infantry had to retire to the vicinity of the garita. Attempts were then made to strengthen the position; but they did not accomplish very much. Ammunition gave out entirely, and firing ceased. The enemy grew bolder. Again and again they charged, and though repulsed they did not appear to be discouraged. By this time every member of Quitman's staff, Beauregard, his engineer officer, and all his artillery officers had been killed or wounded, and he longed anxiously for night.[28.19] Meanwhile, events had occurred on Scott's other wing. Trousdale's command, supplemented with Jackson's guns, pushed along the road and aqueduct on the north side of the rectangle, and the latter distinguished himself by fearlessly attacking a one-gun redoubt, which, supported by infantry and by fire from the summit of the hill, barred the way. To check Mexican reinforcements and threaten the enemy--particularly the troops in Quitman's front--Scott now had Worth, Garland's brigade, C. F. Smith's battalion, Duncan's battery, the rest of Magruder's battery and Sumner's dragoons pursue the same route. The one-gun redoubt was flanked and occupied; and Worth's forces arrived at the northeast corner of the rectangle in time to annoy the retreat of Rangel and other departing Mexicans.[28.20] [THE SAN COSME APPROACH] Here began the broad, straight Verónica causeway--closely similar to that of Belén--which extended almost north for nearly two miles (3530 yards) to the English cemetery, and there joined the San Cosme highway at approximately a right angle. Understanding the difficulties of the Belén approach, Scott intended to make only a feint in that quarter, and let his left wing break into the city. He therefore sent the brigades of Clarke and Cadwalader and also Huger with siege guns to Worth. To organize the attacking column, replenish the ammunition, make other needed preparations, and sweep away the resistance encountered at several minor fortifications, especially near the cemetery, required time; but at about four o'clock Worth found himself on the straight highway about half a mile from the San Cosme garita.[28.20]