The relative strength of the two armies, allowing twenty thousand as lost on both sides, was now considerably over two to one against the French,—the majority on the other side being chiefly composed of fresh men. Wellington was heard to say during the day, "Would to God that Blucher or night would come!" and now both were at hand.

The presence of mind of the Emperor now became most alert, and it was never so clearly manifested as at this critical moment when everything hung in the balance.

The fresh army, advancing to the assistance of the Anglo-Belgian forces, was soon discovered by the French troops, who were in action on the field. The cavalry on the plain were waiting in constant expectation of the Emperor's orders for the advance of his reserves of the infantry of the Guard. They were not alarmed when they saw the communication finally effected between Bulow and the English, but when they perceived the approach of the dense columns of Blucher, they were confounded, and several regiments began to fall back.

Napoleon now sent his aides-de-camp along the whole line to announce the arrival of succor, and that Blucher's advance was only a retreat before Grouchy, who was pressing on his rear. It was a clever ruse, and warranted by the situation in which he now found himself, as it momentarily revived the spirits of the weary troops to a wonderful degree.

At the head of four battalions of the infantry of the Guard, the Emperor now advanced on the left in front of La Haye Sainte. He ordered General Reille to concentrate the whole of his corps near Hougomont and make an attack. He then sent General Friant to support the cavalry on the plain with four battalions of the middle guard. If, by sudden charge, they could break and disorder the centre of the British line before the columns of Blucher could force their way into the plain, a last chance of success still remained. Blucher was hurrying on to La Haye; there was not a moment to lose!

The attack was made, the infantry drove back all that opposed them, and repeated charges of the French cavalry disordered the hostile ranks. Presently some battalions of the Old Guard came up. They too were going to the attack to retrieve the ground lost by the young guard who had fallen back, for, as Thiers says, "It is the privilege of the Old Guard to repair every disaster." The Emperor ranged his veterans by brigades; two battalions being in line, and two in column. As he rode along in front of these battle-scarred battalions, he said, "My friends, the decisive moment is come; it will not do to fire; you must come hand to hand with the enemy, and drive them back at the point of the bayonet into the ravine whence they have issued to threaten the army, the Empire and France."

General Friant was now carried by, wounded. He said that all was going well, but that the attack could not be successful till the balance of the Guard were employed. This movement could not be effected on the instant and in a few minutes it was too late, as the Prussians were coming up in great numbers. The British still stood on the defensive and Blucher had reached the village of La Haye. A violent struggle now ensued, but it was of brief duration; the overwhelming mass of fresh men soon bore down all opposition.

The Duke of Wellington now prepared,—for the first time during the day,—to advance his entire line. He was aware that the decisive moment was at hand and that his safety, as well as that of his gallant men, depended on this last effort.

A panic soon seized some of the French soldiers, exhausted and maddened by the terrible strain they had undergone during the day, and at the sudden appearance before them of the dark mass of fresh assailants, the cry of "Sauve qui peut!" (Every man for himself!) was raised. The disorder soon became general and the men fled as the columns of Prussians poured into the plain.

Napoleon instantly changed the front of the Guard so as to throw its left on La Haye Sainte and its right on La Belle Alliance; he then met the fugitives and led them back to their post. They at once faced the Prussians, whom they immediately charged. The fresh brigade of the English cavalry from Ohain arrived at this crisis and forced their way between General Reille's corps and the Guard, to their utter separation. The Emperor now ordered his four reserve squadrons to charge the fresh brigade of English cavalry but their attack met with no success. As he was leading the four battalions destined to their place of attack on the Charleroi road he met Ney, who was greatly excited, and who declared that the cavalry would certainly give way if a large reinforcement of infantry did not immediately arrive. Napoleon gave him the battalions he was bringing up and promised to send six more.