“You wrote from Gembloux this morning at two o’clock, informing the Emperor, you were about to march to Sart-lez-Walhain. His Majesty now directs you will manœuvre in _our_ direction; you must find out the point, in order to keep up the communication, and be at hand to fall upon and destroy any enemy that may attempt to attack our right. At this moment we are engaged in battle on the line of Waterloo, the enemy’s centre is Mont-St.-Jean; so manœuvre to join our right without loss of time. “The adjutant-general, DUKE OF DALMATIA. “_P.S._—An intercepted letter informs us that the Prussian general Bulow is about to attack our right flank; we think we see the corps on the heights of St.-Lambert; so approach us without losing an instant, and destroy Bulow, should you catch him in the fact.” The order was in itself no doubt sound and judicious; but the original vice we have already alluded to, as characterizing the movements of the French army after the passage of the Sambre, rendered obedience impossible. The letter, written at one o’clock, did not reach Grouchy until seven, about which time Napoleon’s right had been attacked and driven back by Bulow’s advanced brigades. It was half-past seven o’clock A.M. on the 18th of June, when Grouchy moved from his bivac at Gembloux, and, owing to the bad state of the roads, nearly half-past eleven, before he reached Sart-lez-Walhain, a distance of about six miles. At the latter place, the report of a heavy cannonade was distinctly heard in the direction of Waterloo: Grouchy was strongly urged by some of his generals to march towards the firing; and for not doing so, he has been attacked at all points. He declined the proposition of his generals, on the ground that he did not consider it his duty to march towards the battle already raging elsewhere, but to attack, according to his instructions, the Prussians with whom he had just come up. Grouchy has since declared, that he did not consider it his duty to follow the advice of Gérard and the other generals, and that to have done so would have been acting contrary to his orders. To have detached a portion of his force towards the main French army would have separated his two corps by the Dyle river, whose waters were much swollen by the heavy rains, and whose banks were so swampy, that it would have been impossible for his divisions to have mutually supported each other; consequently he continued his march upon Wavre.