Colonel Pack, with the remainder of his command, wheeled rapidly into the Calle Balcarce, and made a desperate assault upon the earthwork which closed the entrance to the Plaza de los Perdices. Over the top of this earthwork frowned the muzzles of two heavy guns, in front yawned a ditch twelve feet wide by six deep. The light infantry rushed up that narrow street straight upon the black muzzles of those guns, while the grape-shot tore through their ranks, and an incessant fire of musketry poured upon them from the azoteas on either hand. They reached the ditch and sprang into it, only to find before them a perpendicular wall of earth twelve feet high, over which they strove to clamber, while hand-grenades, bricks, and all sorts of missiles were showered upon them from above; till seeing no possibility of success, Colonel Pack, who was himself wounded, drew off seventy men, the remnant of his force, and retreated upon the church of Santo Domingo. There he met General Crauford, who had reached that position unopposed, and who at once took possession of the church by blowing open a side door with a shot from a field-piece. On the extreme right of the British line, Colonel Guard, with the 45th regiment, penetrated through the suburbs to the south of the city, and attacked and captured the Residencia with very slight loss, taking about 100 prisoners. The Residencia was at that time used as a hospital, the wards being occupied by 150 sick, many of whom had been wounded in the affair of the 2nd. It was surrounded by high walls and an iron railing, and was a very strong position. Leaving Major Nicholls with 400 men to hold the Residencia, Colonel Guard then advanced with the grenadier company by the Calle Defensa to join General Crauford. Reinforced by that general with a detachment of light infantry, he then attempted to re-open communications with Colonel Cadogan, but had hardly advanced fifty yards from Santo Domingo when the guns on the defences of the Plaza Mayor opened upon him with grape, and a storm of shot poured upon him from the adjacent azoteas. The grenadier company was swept away, Major Trotter of the Rifles was killed, and he, with the few men left, was forced to seek shelter in the church.