Marmont, upon his part, believing that the forts could hold out for fifteen days, put off the attack, as he knew that large reinforcements were coming up. His calculations were frustrated by one of the forts taking fire on the 27th, when an assault was delivered, and the whole of the forts surrendered; Marmont at once fell back across the Douro, there to await the arrival of his reinforcements.

Wellington, on his part, followed slowly, and his army took up a position between Canizal and Castrejon, thereby covering the roads from Toro and Tordesillas, the only points at which the French could cross the river. The reports of the spies all agreed that the former was the place at which the crossing would be made.

On the 16th of July an officer rode into Canizal, at headlong pace, with the news that a reconnoitering party had crossed the Douro that morning near Tordesillas, and had found that place deserted, except by a garrison; and an hour later the news came in that three divisions of the enemy were already across the river at Toro. Five minutes later the Scudamores were on horseback, carrying orders that the whole of the army, with the exception of the fourth and light divisions, which were on the Trabancos, under General Cotton, were to concentrate at Canizal that night. By the morning the movement was accomplished.