Dorsenne was persuaded to assist the Army of Portugal in a great reconnaissance, which was to push back Wellington’s cavalry screen and see what lay behind it. In the morning of September 25th the two cavalry brigades of the Army of the North went out on the Carpio-Espeja roads to sweep the line of the Azava, with Wathier in command. At the same time Montbrun took the bulk of the cavalry of Marmont, two brigades of dragoons and two of light horse, and advanced along the southern road, that which runs from Ciudad Rodrigo past El Bodon towards Fuente Guinaldo. Only one infantry division, that of Thiébault, the weakest in the two armies, was put under arms to support the cavalry, and even these 4,000 men did not leave the immediate vicinity of Ciudad Rodrigo—they merely crossed the Agueda and halted. The two reconnaissances brought on two separate engagements, at a distance of ten miles from each other, of which one had no importance, immediate or ulterior, while the other led to sharp fighting and revealed to the French the weakness of Wellington’s position. The cavalry screen of the allied army was formed as follows: Madden’s Portuguese division lay along the line of the lower Agueda, which was not threatened this day. Anson’s brigade held the line of the Azava, and lay across the Carpio road. Alten’s brigade was strung out along the low hills from south of Carpio to the upper Agueda near Pastores, and had one of its squadrons detached with the Light Division beyond that river, in front of Martiago. Slade’s and De Grey’s brigades were far to the rear, behind Fuente Guinaldo, in Villar de Toro and other villages along the Coa river, and only came up to the front after midday on the 25th.
Wathier’s insignificant engagement on the lower Azava may be dealt with first. About eight in the morning the pickets of the 14th Light Dragoons detected a strong column of cavalry coming out of Rodrigo, and were forced to retire from Carpio and other posts beyond the stream. The enemy could be counted from the hills above, and it was noted that they left six squadrons beside Carpio in reserve, and were advancing with eight more. These crossed the river and felt their way cautiously towards the heights. They were coming straight against the front of the 6th Division, and Graham sent out the light companies of Hulse’s brigade to line the wood which covered the position which he was holding. The two British cavalry regiments (14th and 16th Light Dragoons) gave back to the edge of the wood also, and formed up close to their infantry supports. Misliking the look of the long belt of trees which hid all from him, Wathier halted four squadrons more on the flat ground just beyond the Azava, and moved the other four towards Graham’s unseen line. This advanced guard consisted of the Lancers of Berg and the 26th Chasseurs. When they were feeling their way up the slope their leading squadron was charged and driven back by a squadron of the 14th. The main body, however, picked up the beaten unit and advanced again: when they had got close to the wood, the light companies of the 11th, 61st, and 53rd fired a volley into them, and while they stood staggered by the unexpected salute four squadrons of the 14th and 16th charged them, broke them, and chased them for two miles down to and across the Azava[720]. The French reserve left close to that stream retired at once, covering the broken squadrons. The French lost one officer and ten men killed, and five officers and thirty-two men taken, mostly wounded. The British loss was very small—an officer and ten men wounded and one man missing.
Wathier stayed in line at Carpio, without making a further advance, till evening, and reported that the English were in position with all arms beyond the Azava, and not inclined to give way. This was important news, for, if there were infantry so far north, it was clear that Wellington had not yet concentrated his army on the Fuente Guinaldo line.
Montbrun’s reconnaissance, along the Fuente Guinaldo road, turned out a much more lively and important affair. He started out with a heavy column consisting of two brigades of his own dragoons and two of light cavalry[721], which came into touch with the vedettes of Alten’s brigade almost the moment that it had crossed the Agueda, for the British outposts lay within two miles of Rodrigo. Driving straight before him, Montbrun pierced the screen, and pressing up the slope found himself in the middle of the scattered fractions of the 3rd Division, which Wellington had only just begun to draw together when he saw that the reconnaissance was being made by no less than 2,500 horse. There was not time to concentrate, because the posts of Picton’s battalions were too close to the enemy, and the position was unsatisfactory. Graham, who had surveyed it a few weeks before, remarks in his diary that it was ‘by no means favourable—extensive, yet very narrow, and the right thrown back across the plain towards the ford by Pastores, where there is little advantage of ground but a bank and a little water-run[722].’
At the moment when Montbrun broke through the cavalry screen, Picton’s infantry was strung out on a front of six miles—the 74th and three companies of the 5/60th were at Pastores, near the Agueda, the remainder of Wallace’s[723] brigade (the 1/45th and 1/88th) was three miles south-west of Pastores in the village of El Bodon. Colville’s brigade and the Portuguese were equally split up—the 1/5th and 77th, with the 21st Portuguese in support, being on high ground across the road from Rodrigo to Fuente Guinaldo, in the centre, while the left section of the front of the division (94th, 2/83rd and 9th Portuguese) was on lower ground, two miles west of Colville, in the direction of Campillo. Alten’s cavalry brigade, having sent a squadron of the 11th Light Dragoons to watch Craufurd’s front, beyond the Agueda, and having strong pickets out to right and left, had only 500 sabres left as its main body. These five weak squadrons (three of the 1st Hussars K.G.L., two of the 11th Light Dragoons) were across the high-road, near the 5th and 77th, and with them the two Portuguese batteries under Major Arentschildt which formed the divisional artillery of Picton.
Marmont, on discovering the scattered position of the Allies, could hardly believe that they had nothing more in his front than what he saw—four groups of two or three battalions each, with huge gaps between them. He suspected that Wellington must have reserves close behind, not thinking it likely that he would have kept infantry so close to Ciudad Rodrigo unless he were in force to resist an attack. He accordingly resolved not to send for his infantry from the rear and engage in a serious action, but to direct Montbrun to drive in one section of the hostile front with his heavy column of cavalry, and so to discover the exact strength and position of the Allies[724]. It was lucky for Wellington that the Marshal limited his ambitions to this modest scheme. Montbrun resolved to break in the allied centre, across the high-road, and advanced up it, leaving on his left the two fractions of Wallace’s brigade in Pastores and El Bodon. If he could pierce the centre, this wing would be in a disastrous plight, being cut off from its line of retreat and its power of rejoining Wellington at Fuente Guinaldo. Accordingly the whole of the French horse came up against the position across the road, where Colville’s two battalions and Arentschildt’s batteries blocked the way, while Alten’s five squadrons were covering their flank. The contest was of an abnormal sort, 2,500 horse with one battery attacking a smaller force of all arms—1,000 infantry, 500 sabres, and two batteries[725].
It was most important to Wellington that the detachment across the road should not be driven in, and he gave orders that it was to hold its ground to the last possible minute, in order to allow the battalions in Pastores and El Bodon time to escape from their compromised position, and to fall into the line of retreat behind the detaining force. His command was well obeyed, and a most gallant struggle was kept up for more than an hour, under the Commander-in-Chief’s own eyes.
Montbrun came on with three columns abreast, each formed of a brigade, while a fourth brigade formed his reserve. His left column tried to turn the right of Alten’s cavalry, his centre column attacked its front, his right column, supported by a horse-artillery battery, moved up against the Portuguese guns and their infantry supports. There was fierce fighting all along the line: the allied horse, aided by the steep slope in their favour, made a wonderful fight against the superior numbers of the enemy, who had to attack in each point on a narrow front, since only parts of the hillside were open ground suitable for cavalry movements. Each time that the leading French squadron neared the crest it was charged and thrown back. The 11th and one squadron of the Germans dealt with the flank attack, the rest of the legionary hussars with that in the centre. The defence was most desperate, consisting in a long series of partial charges, in which one or more of the defending squadrons beat back the head of the hostile advance, and then retired under cover of the others. Montbrun, having six or seven regiments with him, was always able to launch a new attack up the hillside the moment that the last had been foiled. The colonel of the German hussars wrote that from first to last the enemy came on nearly forty times, yet never was allowed to reach the crest: the individual squadrons of his regiment and of the 11th had charged eight or nine times each[726].
Meanwhile, to the right of the plateau which the cavalry defended so gallantly, the third French cavalry column had attacked the Portuguese batteries whose fire was sweeping down the road. A dragoon brigade, though suffering heavily from the grape poured into it as the range grew close, succeeded in making its way to the guns, and burst in among them, capturing four pieces; the artillerymen had held their ground to the last, and earned Wellington’s praise for their steadiness. But the pieces were not lost; close in support of them was the first battalion of the 5th regiment under Major Ridge, who, when the hostile horsemen halted for a moment around the captured guns, attacked them without hesitation in line. The battalion advanced firing, and with three volleys broke the dragoons, who were blown with their charge and in much disorder. They recoiled down the hill in complete rout, and the Portuguese gunners were able to get their pieces in action again and resume their very effective fire[727]. This was a rare example of a successful attack on cavalry by infantry in line: it could not have been tried against intact squadrons, for there was no flank-support for the 5th, and an enemy in good order would have turned the battalion and cut it up from the side. But Ridge saw that the French were in complete disarray, and unfit for the moment to manœuvre, wherefore he was justified in trying the dangerous-looking movement which had such complete success.
The French at last gave up their frontal attacks; it is said that when the trumpets blew for one more advance, the Allies saw the regiment at the head of the column refuse to move forward. Montbrun thereupon tried a move which he might well have made half an hour earlier; he began to extend his hitherto concentrated brigades, and thrust one of them into the gap between the hill that he could not force and the village of El Bodon.