During this desultory _fusillade_, the baggage belonging to the French division debouched from the already described outlet. The whole of the enemy's escort huddled together, and made a most desperate resistance amidst the rocks, while their affrighted animals ran loose, and were seen on the highest pinnacles of precipices. Nearly the whole fell into our hands, besides three hundred wounded and prisoners. The position of the division became singular after the fight, with its centre at the village St. Millan, and keeping a look-out to the front and rear. The enemy had also attacked the left of our army, near Osma, in hopes that, by causing such a delay, it would enable these two brigades, marching from Frias, to form a junction with their main body. On the 19th we moved forward, and, at about ten o'clock in the morning, part of the fourth division became engaged with the light troops of the enemy. Our division then made a short _détour_, and turned the left of the French, who precipitately retired towards Vittoria. The next day we halted, and the army took up a line on the river Bayas, after long and arduous marching. The Marquis of Wellington approached the river Zadorra, which covered the enemy's position, for the purpose of examining the ground they occupied, and pointing out to different generals the various debouches, and their necessary line of attack, in the event of the French continuing to occupy the same ground on the following day. On the 21st, we stood to our arms, and moved forward in darkness, some time before daybreak. A heavy shower of rain fell; but, as morning dawned, the clouds dispersed, and the sun arose with fiery splendour. A towering and steep ridge of mountains rose abruptly from the valley on our right, which the Spaniards climbed early in the morning, at first unopposed; the ascent was so steep, that, while moving up it, they looked as if they were lying on their faces, or crawling. They were supported, and soon followed across the river Zadorra, and through the town of Puebla de Arlanzon, by part of the second division, for the purpose of attacking the left of the enemy, who were posted on the heights above Puebla de Arlanzon and Sabijana de Alava, where the contest, at the former place, began at nine o'clock, amongst deep ravines, rocks and precipices. The second division becoming heavily engaged with the enemy, under all these disadvantages it could only maintain the ground already won, and the firing seemed to die away in that quarter. Our right centre, composed of the light and fourth divisions, continued to advance, as also the great bulk of our cavalry.