Upon the 21st both armies crossed the Tormes, the French at Alba and Huerta, the British at Aldea Lengua, and San Marta. Upon that day the news reached Wellington that General Chauvel, with 2000 cavalry, and 20 guns, would reach Marmont on the evening of the 22d, or the morning of the 23d, and the English general therefore resolved to retreat, unless Marmont should, by some mistake, give him a chance of fighting to advantage. Close to the British right, and the French left, were two steep and rugged hills, called the Hermanitos, or Brothers, and soon after daybreak on the 22d, the French seized upon the one nearest to them, while the British took possession of the other. Then, watching each other, the two armies remained until noon, for Wellington could not commence his retreat by daylight; but a long cloud of dust along the road to Ciudad Rodrigo showed that the baggage of the army was already _en route_ for Portugal. Marmont now determined to make a bold stroke to cut off Wellington's retreat, and, although all his troops had not yet arrived, he ordered Maucune, with two divisions, to march round by the left and menace the Ciudad road. It was at three o'clock in the afternoon, and Wellington, who had been up all night, thinking that Marmont would make no move that day, had gone to lie down for an hour or two, when Tom Scudamore who, from an elevated point, was watching the movements of the enemy, hurried in with the news that the French were pushing their left round towards the Ciudad Road. Wellington leaped to his feet, and hurried to the high ground, where he beheld, with stern satisfaction, that Marmont, in his eagerness to prevent the British escape, had committed the flagrant error of detaching his wing from his main body. Instantly he issued orders for an attack, and the great mass of men upon the British Hermanito moved down upon the plain to attack Maucune in flank, while the third division was ordered to throw itself across his line of march, and to attack him in front. As the advance across the plain would be taken in flank by the fire from the French Hermanito, General Pack was ordered to assail that position directly the British line had passed it. Marmont, standing on the French Hermanito, was thunder-struck at beholding the plain suddenly covered with enemies, and a tremendous fire was at once opened upon the advancing British. Officer after officer was despatched to hurry up the French troops still upon the march, and when Marmont saw the third division dash across Maucune's path, he was upon the point of hurrying himself to the spot, when a shell burst close to him, and he was dashed to the earth with a broken arm, and two deep wounds in his side. Thus, at the critical point of the battle, the French army was left without a head.