The plan which Wellington evolved for the final eviction of the French from Portugal was to turn their left wing on the side of Sabugal, while containing their right wing (the 6th Corps) on the central Coa. Occupation was at the same time found for the 9th Corps, as Wilson’s and Trant’s Militia brigades were directed to cross the Coa near its confluence with the Douro, and to threaten Almeida from the north side, a move which could not fail to have the effect of keeping Drouet pinned down to his present position, since his special task was the protection of that place. It is a little difficult to make out why Wellington chose to break in upon the French left rather than their right. From the strategical point of view it would have been preferable to cross the Coa north of the flank of the 6th Corps, and to throw the whole weight of the British army so as to drive the French southward, towards Sabugal and Alfayates. For they would thus be separated from the 9th Corps, thrust into the barren and nearly roadless mountain district of the Sierra de Gata and the Sierra de Meras, and cut off from Almeida and even from Ciudad Rodrigo, which they were desirous of covering. Whereas to turn their left wing would only have the effect of pushing them back on their natural line of retreat towards Rodrigo, and would press them towards rather than away from the 9th Corps. The British general’s course seems, however, to have been guided by tactical rather than by strategical considerations. He thought that he had a good opportunity of catching the 2nd Corps at Sabugal in an isolated position, and crushing it, before the 6th or the 8th could come up to its help. And but for a chance of the weather it seems that he might have accomplished this design with complete success. Sabugal, a little walled place with a ruined Moorish castle, lies in a projecting bend or hook of the Coa, which turns back just above the town at right angles to its original course, which is directly from east to west. The river is not far from its source, and though its banks are steep its waters are narrow, and there are many fords both above and below Sabugal. If a strong turning column, concealing itself in the hills, passed along the south bank of the Coa, and crossed the river some miles above the town, it could throw itself upon the rear of the 2nd Corps and cut it off from its retreat on Alfayates. Meanwhile a general attack by Wellington’s main body would drive it from its position straight into the arms of the turning column, and there would be a good chance of inflicting a crushing defeat upon the corps, perhaps of capturing it wholesale. If the attack were delivered by surprise at dawn, the whole matter ought to be completed before either the 6th or the 8th Corps could get up to the support of Reynier. When at last they could appear on the field, the 2nd Corps would be already demolished, and Wellington was prepared to risk a general action.