The First Skirmish
Soult had spent a month in making his preparations for the invasion of Portugal. The time, however, had not been wasted by him. Vigo, Tuy, and Guardia had all been occupied without opposition. Salvatierra on the Minho had been taken possession of, and thus three roads were open to him by which to cross low down on the river, namely, at Guardia, Tuy, and Salvatierra. These roads afforded the shortest and easiest line to Oporto. Romana and Silveira had both been of opinion that he would march south from Orense, through Monterey, and up the valley of the Tamega, and their plans were all made with a view of opposing his advance in that direction. The night before Terence marched he called upon Romana.

"It seems to me probable, Marquis, as it does to you, that the French will advance by this line, but it is possible that they may follow the north bank of the Minho and cross at Salvatierra or Tuy. By that route they would have several rivers to cross but no mountains or defiles. Were they to throw troops across there they would meet with no opposition until they arrived at Oporto. It seems to me that my best plan would be to march west and endeavour to prevent such a passage being made. If I could do so it would prevent your position being turned. There are no bridges marked on my map, and if I could secure the boats we should, at any rate, cause Soult much difficulty and delay. No doubt there are some local levies there, and we should be able to watch a considerable extent of the river; indeed, so far as I can see, they must cross, if they cross at all there, at one of the three towns on the north side, for it is only by the roads running through these that they could carry their artillery and baggage."