The British troops continued to advance in pursuit of the enemy, and on the morning of the 27th of June forced their passage across the Chualo. Some skirmishing followed this movement, but the city of _Buenos Ayres_ almost immediately surrendered. In the evening the town and fort were taken possession of by the first battalion of the SEVENTY-FIRST and detachments of Marines and St. Helena Regiment. The SEVENTY-FIRST occupied barracks in Buenos Ayres, and remained undisturbed until the beginning of August, by which time the enemy had collected a force of about 1,500 men, under a leader named Pueridon, at five leagues from the city. Brigadier-General Beresford, in consequence, moved out with three hundred of the SEVENTY-FIRST, fifty from the St. Helena Regiment, and six field pieces; attacked and dispersed the enemy, taking all his artillery, namely, ten pieces of various calibre. The battalion had only five men wounded in this operation. About this period, a body of the enemy, headed by Colonel Liniers, a French officer in the service of Spain, crossed from Colonna to Concher, evidently with hostile intentions. Forming a junction with the force under Pueridon, the whole marched upon Buenos Ayres. On the 10th of August the enemy commenced operations, by the massacre of a serjeant and his guard of the SEVENTY-FIRST Regiment, who were posted at a place in the suburbs where the bull-fights were usually exhibited. On the following day much skirmishing ensued in the outskirts of the city, the enemy taking possession of the tops of houses, from which he kept up a galling and destructive fire. During this time the main body of the British force took up a position in the Grand Square, but afterwards retired into the fort of Buenos Ayres. Being now bereft of all resources, and without hopes of reinforcement, there appeared no alternative but to capitulate, and about one o’clock on the 12th of August hostilities ceased, and the fort was surrendered. The troops marched out with the honors of war, and laid down their arms in the Square. The SEVENTY-FIRST were now prisoners; the officers were allowed their parole, and quartered upon the inhabitants; the men were confined in the prisons of the city. In these melancholy proceedings fell Lieutenant William Mitchell and Ensign Thomas Lucas. Both had much distinguished themselves. The battalion lost in killed and wounded ninety-one men. [Sidenote: 2d bat.] In August 1806 the second battalion embarked at Glasgow for Ireland, and arrived at Belfast on the 1st of September. [Sidenote: 1st bat.] About the middle of September, the SEVENTY-FIRST were removed from Buenos Ayres into the interior. Brigadier-General Beresford, with his staff, and Lieut.-Colonel Pack, were placed at Luxon, from whence they subsequently effected their escape, upon learning that the removal of the prisoners still further up the country had been ordered. [Sidenote: 1807.]