4th DIVISION.—BRIG.-GEN. A. CAMPBELL. 1st Brigade, 7th, 53d, Regiments, 1 Comp. 5 Batt. 60th Regiment. 2nd Brigade, 2 Batt. Detachment, 97th Regt. 1 Comp. 5 Batt. 60th Regiment. To these was to be added the Lusitanian legion under Sir R. Wilson, being the only Portuguese troops employed in this operation. This distribution into divisions was the first step to the gradual growth of these corps into little armies, complete in themselves like the Roman legions, being, (with the sole exception of cavalry,) about their strength. The light companies of the regiments composing them were formed into a battalion, which under some intelligent officer, ever marched at the head, and to which was added a company or more of the deadly riflemen of the foreign corps, the 60th. These were the Velites, while the battalions were all worthy to be considered as Triarii or Principes. They had subsequently artillery, spare ammunition, and engineer, medical, and commissariat staff attached to them; and when each was increased in 1810, by a Portuguese brigade, consisting of a battalion of light infantry, and two line battalions, they became in themselves superior in numbers to some of the petty expeditions in which England has often placed her hope, while they have only wasted her strength. Our whole force of British did not consist of 18,000 men, principally of men raised by the voluntary enrolment of the militia. We learned at Placentia, that the French occupied Talavera de la Reyna, and were supposed to be waiting for reinforcements from Madrid and La Mancha. During the concentration of the army at Placentia, Sir Arthur had his first personal communication with Cuesta at Casa del Puertos. His Excellency passed in review the Spanish army, and definitively settled the plan of the campaign. The British army was to cross the Teitar, and direct its march upon Oropesa, where it was to form a junction with the Spanish army from Almaraz, and to advance on Talavera de la Reyna. The cavalry of the Spaniards under the Duke of Albuquerque, and the division of infantry commanded by Ballasteros, were to continue and move on the left bank of the Tagus, and cross that river at the Puente del Arzobispo. To diminish and separate the enemy's force, and distract their attention, General Vanegas from La Mancha was to threaten Aranjuez, while Sir R. Wilson, who was already on the Teitar, was to have, besides his own corps, some few Spanish troops, and to act upon their other flank, and by pushing to and beyond Escalona, make them uneasy respecting the capital.