On the evening of the 28th the enemy’s cavalry entered Boyalva, driving in a piquet of the Light Dragoons. It is an open village, on the western slope of the hill, where there is no defile, and where the ground is not broken. Trant was then at Sardam, where, during the following day and night, he occupied one half the united villages, the enemy’s cavalry occupying the other. As he could no longer be of service here, and was aware that he should be attacked in the course of the day if he remained longer, early on the 30th he resolved to retire behind the Vouga. La Croix, who, with a column of horse, was scouring the country upon the right flank of the invading army, fell in with his outposts, attacked them, and drove them in with the loss of one officer and five-and-twenty men[22]. The infantry, by good fortune, had effected their passage; they formed in defence of the bridge, and La Croix having no infantry, did not attempt to force it. The Vouga was at this time fordable, and therefore Trant marched in the night to Oliveira, on the Porto road, from whence, if it should be necessary, he could in one day reach the Douro, and cross it for the defence of that city. There were then no other troops to defend it, and if the enemy had pursued, Porto might have been a second time in their power. That this was not done is not surprising, because it did not consist with the scheme of Massena’s operations; but that the French should have neglected so fair an opportunity of dispersing Trant’s force, which if not dispersed might be expected presently to harass their rear, must be accounted among those errors with which the whole course of human events is marked, and in which the religious mind perceives the superintendence of a higher power than man.
The allies being on the shorter line to Coimbra, were sufficiently in advance of the enemy for all their movements to be conducted with the same coolness and order which had characterized the whole retreat. On the 30th the infantry crossed from Coimbra into the great Lisbon road. The rear-guard of cavalry bivouacked in front of Fornos, and remained bridled up all night, in a very dangerous situation, the enemy having pushed a strong force close to ♦OCT. 1.♦ them. In the morning they were driven in some confusion through Fornos by a large body of horse and foot: they formed on the great plain of Coimbra, and the French seeing the three brigades of cavalry with six guns of the horse artillery ready to receive them, did not venture to leave the inclosures. Before noon the rear-guard received orders to retire, and crossed the Mondego accordingly at the fords near S. Martinho do Bispo. The enemy pushed on their horse, came up just as the passage had been effected, and attempted to cross, as if in pursuit: they were charged, and driven back by a squadron of the 16th, after which they dismounted, and fired with their carbines ineffectually across the river. The passage might have been defended with good prospect of success, but this was not consistent with Lord Wellington’s plans, which were to draw the French to a point where they should be at the greatest distance from their resources, and where his own would be at hand.