From Chaves Soult had the choice of two roads for marching on Oporto. The more obvious route on the map is that which descends the Tamega almost to its junction with the Douro, and then strikes across to Oporto by Amarante and Penafiel. But here, as is so often the case in the Peninsula, the map is the worst of guides. The road along the river, frequently pinched in between the water and overhanging mountains, presents a series of defiles and strong positions, is considerably longer than the alternative route, and passes through difficult country wellnigh from start to finish. The second path from Chaves to Oporto is that which strikes westward, crosses the Serra da Cabrera, and descends into the valley of the Cavado by Ruivaens and Salamonde. From thence it leads to Braga, on the great coast-road from Valenza to Oporto. The first two or three stages of this route are rough and difficult, and pass through ground even more defensible than that on the way to Amarante and Penafiel. But when the rugged defiles of the watershed between the Tamega and the Cavado have been passed, and the invader has reached Braga, the country becomes flat and open, and the coast plain, crossed by two excellent roads, leads him easily to his goal. It has also to be remembered that, by adopting this alternative, Soult took in the rear the Portuguese fortresses of the lower Minho, and made it easy to reopen communications with Tuy and the French forces still remaining in Galicia. If any other persuasion were needed to induce the Marshal to take the western, and not the eastern, road to Oporto, it was the knowledge of the position of the enemy which he had attained by diligent cavalry reconnaissances. It was ascertained that Silveira with the remains of his division had fallen back to Villa Pouca, more than thirty miles away, in the direction of Villa Real. He could not be caught, and could retreat whithersoever he pleased. Freire, on the other hand, was lying at Braga with his unwieldy masses, and had made no attempt to march forward and fortify the passes of the Serra da Cabrera. By all accounts that the horsemen of Franceschi could gather, the defiles were blocked only by the _Ordenanza_ of the mountain villages.