After some fatiguing marches through a country much intersected by swamps and deep muddy rivulets, the army reached _Reduction_, a village about nine miles distant from the bridge over the _Rio Chuello_, on the opposite bank of which the enemy had constructed batteries, and established a formidable line of defence. I resolved, therefore, to turn the position, by marching in two columns from my left, and crossing the river higher up, where it was represented fordable, to unite my force in the suburbs of _Buenos Ayres_. I sent directions at the same time to Colonel Mahon, who was bringing up the greater part of the artillery, under the protection of the 17th light dragoons and 40th regiment, to wait for further orders at _Reduction_. Major-General Levison Gower having the command of the right column, crossed the river at a pass called the _Passo Chico_, and falling in with a corps of the enemy, gallantly attacked and defeated it; for the particulars of which action I beg to refer you to the annexed report. Owing to the ignorance of my guide, it was not until next day that I joined with the main body of the army, when I formed my line by placing Brigadier-General Sir Samuel Achmuty’s brigade upon the left, extending it towards the convent of the _Recolleta_, from which it was distant two miles, the 36th and 88th regiments being on its right, Brigadier-General Craufurd’s brigade, occupying the central and principal avenues of the town, being distant about three miles from the great square and fort; and the 6th dragoon guards, 9th light dragoons, and 45th regiment being upon his right, and extending towards the _Residencia_. The town was thus nearly invested; and this disposition of the army, and the circumstances of the town and suburbs being divided into squares of 140 yards each side, together with the knowledge that the enemy meant to occupy the flat roofs of the houses, gave rise to the following plan of attack:--Brigadier-General Sir Samuel Achmuty was directed to detach the 38th regiment to possess itself of the _Plaza de Tauros_ and the adjacent strong ground, and there take post. The 87th, 5th, 36th, and 88th regiments were each divided into wings, and each wing ordered to penetrate into the street directly in its front. The light battalion divided into wings, and each followed by a wing of the 95th regiment and a 3-pounder, was ordered to proceed down the two streets on the right of the central one, and the 45th regiment down the two adjoining, and after clearing the streets of the enemy, this latter regiment was to take post at the _Residencia_. Two 6-pounders were ordered along the central street, covered by the carabineers and three troops of the 9th light dragoons, the remainder of which was posted as a reserve in the