“The advance of such weak battalions, with the great gaps between, appeared hazardous, and General Lord Uxbridge, who commanded the cavalry, drew the Duke’s attention to the danger; the Duke, however, would not order them to stop. * * * The Duke with his practised eye perceived that the French army was no longer dangerous; he was equally aware, indeed, that, with his infantry so diminished, he could achieve nothing more of importance: but if he _stood still_, and resigned the pursuit to the Prussian army _alone_, it might appear in the eyes of Europe as if the English army had defended themselves bravely indeed, but that the Prussians alone decided and won the battle.” The rout of the divisions of Durutte and Marcognet was entirely due to Zieten’s attack; this is universally admitted. Had it not been for Zieten, then, the only contest that would have gone on that evening would have been at and near Planchenoit; and it is hard to suppose that Napoleon could not have maintained his position there, if he had had his whole army to draw from when the Young Guard and Lobau needed reinforcements. To the unexpected irruption of Zieten’s Corps,—or rather of his leading division of infantry, all his cavalry, and most of his artillery,—arriving at the close of the day, on the flank of the army, and in perfectly open ground, is the rout of the French army, therefore, principally to be attributed. 8. It only remains to discuss the question of the responsibility for the intervention of the Prussians, as between the Emperor and Marshal Grouchy. It may fairly be said that if either of them had taken all the steps which the situation, as it presented itself to his mind, demanded, this intervention might have been prevented. If the Emperor, when he thought it possible that the Prussians might be intending to unite with the English, had taken Grouchy with him, and had stationed his two corps, or one of them, on the day of the battle, at or near Lasne and St. Lambert, or if he had employed one or both of Grouchy’s corps in attacking the English, Blücher, it is safe to say, would not have interfered in the duel between Napoleon and Wellington. If, after sending Grouchy off, Napoleon had informed him of the impending battle, and had charged him to return to the main army by way of Moustier if he found that the Prussians had gone to Wavre, it is altogether probable that the march of the Prussians would have been arrested. On the other hand, if Grouchy had acted of his own motion on sound military principles at daybreak of the 18th, or even had been willing to follow the counsel of Gérard at noon, the same result would probably have been attained.