on the field, should advance by Nivelles and Binche towards Péronne. The 4,000 Prussian cavalry, that kept up an energetic pursuit during the night of 18 June, under the guidance of Marshal Gneisenau, helped to render the victory at Waterloo still more complete and decisive; and effectually deprived the French of every opportunity of recovering on the Belgian side of the frontier and to abandon most of their cannons. A defeated army usually covers its retreat by a rear guard, but here there was nothing of the kind. The rearmost of the fugitives having reached the river Sambre, at Charleroi, Marchienne-au-Pont, and Châtelet, by daybreak of 19 June 1815, indulged themselves with the hope that they might then enjoy a short rest from the fatigues which the relentless pursuit by the Prussians had entailed upon them during the night; but their fancied security was quickly disturbed by the appearance of a few Prussian cavalry, judiciously thrown forward towards the Sambre from the Advanced Guard at Gosselies. They resumed their flight, taking the direction of Beaumont and Philippeville. From Charleroi, Napoleon proceeded to Philippeville; whence he hoped to be able to communicate more readily with Marshal Grouchy (who was commanding the detached and still intact right wing of the Army of the North). He tarried for four hours expediting orders to generals Rapp, Lecourbe, and Lamarque, to advance with their respective corps by forced marches to Paris (for their corps locations see the military mobilisation during the Hundred Days): and also to the commandants of fortresses, to defend themselves to the last extremity. He desired Marshal Soult to collect together all the troops that might arrive at this point, and conduct them to Laon; for which place he himself started with post horses, at 14:00. The French army, under Soult, retreated on Laon in great confusion. The troops commanded by Grouchy, which had reached Dinant, retired in better order; but they were cut off from the wreck of the main army, and also from the direct road to Paris. Grouchy, therefore, was compelled to take the road to Rethel whence he proceeded to Rheims; and by forced marches he endeavoured to force a junction with Soult, and thus reach the capital before the Coalition armies. In the meantime, Wellington proceeded rapidly into the heart of France; but as there was no enemy in the field to oppose his progress, the fortresses