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."

"I think that will be an excellent plan," Romana said, "for although I believe that they will come this way, I have been very uneasy at the thought that they might possibly cross lower down, and so turn our position altogether. But you will have to watch not only the three places through which the roads pass, but other parts of the river, for they may throw a few hundred men across in boats at any point, and these falling suddenly upon your parties on the bank, might drive them away and enable the main body to cross without resistance."

"I will keep as sharp a look-out as I can, Marquis." Marching north from Monterey the troops moved through Villa Real and Gingo, and then, turning west, crossed the river Lima, there a small stream, and then following the valley of that river for some distance, turned off and struck the Minho opposite Salvatierra, having covered fifty miles in two days. Here a considerable number of armed peasants and ordenanças were gathered. They were delighted at the arrival of two well-armed regiments; and hearing from Herrara that Terence was a staff-officer of the British general, and was sent by him to direct the defence of the river, they at once placed themselves under his orders.

Terence found, to his satisfaction, that on the approach of the French most of the boats had been removed to the south side of the river and hauled up the bank. His first order was that anyone acquainted with the position of any boats on the other side of the river should at once inform him of it. It was not long before he heard of some twenty or thirty that had been hidden by their owners on the other side, in order that they might have the means of crossing to escape the French exactions. At nightfall several boats were launched, and parties of men, directed by those who had given information, started to cross the river and bring those boats over. The Minho was at this time in flood and was running with great rapidity, and Terence felt confident that in its present state none of the enemy's cavalry would attempt to cross it by swimming.

He decided on placing the largest part of his force opposite Tuy, as the principal road south passed through this town, and he would here be supported by the guns of the fortress of Valenca. He stationed his first battalion here, with orders to line the river for six miles above and below this spot. Half of the second battalion he left under Macwitty, and with the other half determined to march down towards the mouth of the river. The next morning all the boats returned, bringing those for which they had been searching, and after closely questioning the guides he felt assured that there could be so few remaining that the French would hardly attempt to cross the river in the face of the crowd of peasants--whom they could not but see--lining the southern bank.

As soon as the boats had returned he marched with the three companies. When half-way between Valenca and Caminha he met a peasant, who had crossed from the northern bank in a boat that had escaped the search of the French. He reported that some days before some 10,000 of the French had arrived in the neighbourhood of the village Campo Sancos, and that a division had been hard at work since their arrival transporting some large fishing-boats and heavy guns from the harbour of Guardia to Campo Sancos. The guns had been placed in a battery on a height, and the boats launched in a little river that ran into the Minho village. Terence learned that the work was now nearly completed, and the peasant had risked his life in coming across to give information.

Terence at once sent off a mounted man to Valenca to request Herrara to march down with the first battalion and to send on to Macwitty to leave one company to assist the ordenanças to guard the river between Salvatierra and Valenca, and to take post with the other two in front of the latter town. At nightfall he was joined by Herrara.

After explaining the situation to him, Terence said:

"It will not be necessary to watch the river above Campo Sancos, for it would be impossible to row heavy fishing-boats against this stream, so they must land somewhere between that place and the mouth of the river. Thus we have only some eight miles to guard, and as we have eighteen hundred men, besides the peasants, we ought to be able to do that thoroughly. I expect they will endeavour to make the passage to-night, and they will certainly cross, as nearly as they can, opposite the village. The battery is about a mile below it, and is no doubt intended to cover their landing. I shall post myself with two companies of the first battalion there, and extend another company from that point up to Campos Sancos. You, with the other three companies and the three companies of the second battalion, will watch the river below.