The last charge of what remained of the guard took place almost at the moment when Durutte was finally routed. Wellington then sent in the fresh cavalry brigades of Vivian and Vandeleur against the column of Donzelot and the remnants of the French cavalry. These swept all before them, and then the duke gave the order for a general advance. The French left fell into panic, and fled toward Belle Alliance. Before La Haye Sainte stood two squares of French soldiers, the favored legion chosen to protect the imperial headquarters. In the fatal hour it splendidly vindicated the choice, and amid the chaos stood in perfect order. Throughout the famous charge of his devoted men Napoleon rode hither and thither, from Rossomme to Belle Alliance. His looks grew dark, but at the very last he called hoarsely to the masses of disorganized troops that came whirling by, bidding them to stand fast. All in vain; and as the last square came on he pressed inside its serried wall. It was not too soon, for the Prussians had now joined the forward movement, and in the supreme disorder consequent the other square dissolved. Napoleon's convoy withstood the shock of a charge from the Twelfth British light dragoons, and again of a Prussian charge at Rossomme, where Gneisenau took up the fierce pursuit. Though assaulted, and hard beset by musketry, the square moved silently on. There were no words except an occasional remark addressed by Napoleon to his brother Jerome, or to one of the officers. At eleven Genappe was reached; there, such was the activity of the pursuers, all hope of an orderly retreat vanished, and the square melted away. Napoleon had become an object of pity--his eyes set, his frame collapsed, his great head rolling in a drowsy stupor. Monthyon and Bertrand set him as best they could upon a horse, and, one on each side, supported him as they rode. They had an escort of forty men. At Quatre Bras they despatched a messenger to summon Grouchy, bidding him to retire on Namur. The Prussians were only one hour behind. At daybreak the hunted Emperor reached Charleroi, but his attendants dared not delay; two rickety carriages were secured, and it was not until the wretched caravan reached Philippeville that the fugitives obtained a few hours' repose.