As his character already stands so high, it is almost unnecessary to state, that from my second in command, Major-General Levison Gower, I have experienced every zealous and useful assistance. My thanks are likewise due to Brigadier-Generals Sir Samuel Achmuty and Lumley, and to Colonel Mahon, and to Brigadier-General Craufurd, commanding brigades. I cannot sufficiently bring to notice the uncommon exertions of Captain Fraser, commanding the royal artillery, the fertility of whose mind, zeal and animation in all cases, left difficulties behind. Captain Squire, of the royal engineers, is also entitled to my best thanks. Nor should I omit the gallant conduct of Major Nichols, of the 45th regiment, who, on the morning of the 6th instant, being pressed by the enemy, near the _Residencia_, charged them with great spirit, and took two howitzers and many prisoners. Lieutenant-Colonel Bradford, Deputy Adjutant-General, has likewise a great claim to my approbation, as a gallant and promising officer. The officers of my personal staff, Lieutenant-Colonel Torrens, military secretary, Captains Brown, Foster, Douglas, and Whittingham, aides-de-camp, must also be mentioned by me in terms of just regard. The knowledge which the latter possesses of the Spanish language has been eminently useful to me. This despatch will be delivered to you by Lieutenant-Colonel Bourke, Deputy-Quartermaster-General, who has afforded me that assistance which might be looked for from an officer of his military talents and attachment to the service; to whom I beg to refer you for any further particulars respecting the military operations in this part of the world.--I have the honour to be, &c. (Signed) JOHN WHITELOCKE, Lieutenant-General. The Right Hon. W. Windham, &c. &c. &c. Copy of Letter from Lieutenant-General Whitelocke, to the Right Honourable William Windham, dated July 10th, 1807.--Private. BUENOS AYRES, _July 10th, 1807_.