The Prussian troops at Maladrie checked, for a time, the advance of the French upon Thuin, and maintained their ground for more than an hour, with the greatest bravery. They were overpowered, and driven back upon Thuin. This place was occupied by the 3rd Battalion of the 2nd Westphalian Landwehr, under Major Monsterberg, who, after an obstinate and gallant resistance, during which the Battalion suffered an immense loss, was forced to retire, about seven o'clock, upon Montigny, where he found Lieutenant Colonel Woisky, with two Squadrons of the 1st West Prussian Dragoons.
The French succeeded in taking this village, and the retreat was then continued in good order, under the protection of Woisky's Dragoons, towards Marchienne au Pont; but before reaching this place, the latter were attacked, and completely overthrown by the French Cavalry; and the Infantry getting into disorder at the same moment were partly cut down, and many were taken prisoners. Indeed so severe was the loss which the 3rd Battalion of the 2nd Westphalian Landwehr suffered in this retreat, that the mere handful of men which remained could not possibly be looked upon as constituting a Battalion in the proper meaning of the term. It was reduced to a mere skeleton. Lieutenant Colonel Woisky was wounded on this occasion; but continued, nevertheless, at the head of his Dragoons.
Captain Gillhausen, who, as before stated, commanded the Prussian Battalion posted at Lobbes, as soon as he had satisfied himself that Thuin was taken, saw the necessity of effecting his own retreat, which he did, after the lapse of half an hour, drawing in his Picquets, and occupying the Bridge over the Sambre with one Company. He then fell back, and occupied the Wood of Sar de Lobbes, where he received an Order, as soon as the Post of Hoarbes was also taken by the Enemy, to continue his retreat, taking a direction between Fontaine l'Evêque and Anderlues.
The Post at Abbaye d'Alnes, occupied by the 3rd Battalion of the 1st Westphalian Landwehr, under the temporary command of Captain Grollmann, also fell into the hands of the French, between eight and nine o'clock.
As soon as the Commander of the First Prussian Brigade—General Steinmetz—was made acquainted with the attack upon his most Advanced Posts along the Sambre, he despatched an Officer of his Staff—Major Arnauld—to the Dutch-Belgian General van Merlen at St Symphorien, situated on the road between Binche and Mons, to make him fully acquainted with what had taken place, and with the fact that his Brigade was falling back into position. On his way, Major Arnauld directed Major Engelhardt, who commanded the Outposts on the right, to lose not a moment in withdrawing the chain of Picquets; and on arriving at Binche, he spread the alarm that the French had attacked, and that the Left of the Brigade was warmly engaged, which rendered it necessary that the Right should retire with the utmost expedition. Until this Officer's arrival, the Prussian troops in this quarter were wholly ignorant of the attack; the state of the atmosphere, to which allusion has already been made, having prevented their hearing the slightest sound of any firing. They had a much greater extent of ground to pass over in retreat than the rest of the Brigade, and yet, by the above unfortunate circumstance, they were the last to retire.
Zieten, having ascertained, about eight o'clock, that the whole French Army appeared to be in motion, and that the direction of the advance of its Columns seemed to indicate the probability of Charleroi and its vicinity being the main object of the attack, sent out the necessary Orders to his Brigades. The First was to retire by Courcelles to the position in rear of Gosselies; the Second was to defend the three Bridges over the Sambre, at Marchienne au Pont, Charleroi, and Châtelet, for a time sufficient to enable the First Brigade to effect its retreat towards Gosselies, and thus to prevent its being cut off by the Enemy, after which it was to retire behind Gilly; the Third and Fourth Brigades, as also the Reserve Cavalry and Artillery, were to concentrate as rapidly as possible, and to take up a position in rear of Fleurus.
The three points by which the First Brigade was to fall back, were Mont St Aldegonde, for the troops on the right, Anderlues for those in the centre, and Fontaine l'Evêque for the left. In order that they might reach these three points about the same time, Zieten ordered that those in front of Fontaine l'Evêque should yield their ground as slowly as the Enemy's attack would admit. Having reached the line of these three points, about ten o'clock, the Brigade commenced its further retreat towards Courcelles, having its proper Left protected by a separate Column consisting of the 1st Regiment of Westphalian Landwehr and two Companies of Silesian Rifles, led by Colonel Hoffmann, in the direction of Roux and Jumet, towards Gosselies.
At Marchienne au Pont stood the 2nd Battalion of the 6th Prussian Regiment, belonging to the Second Brigade of Zieten's Corps. The Bridge was barricaded, and with the aid of two guns, resolutely maintained against several attacks; after which these troops commenced their retreat upon Gilly, by Dampremy. In the latter place were three Companies of the 1st Battalion of the 2nd Regiment of Westphalian Landwehr, with four guns. These also retired about the same time towards Gilly, the guns protecting the retreat by their fire from the Churchyard; after which they moved off as rapidly as possible towards Gilly, while the Battalion marched upon Fleurus; but the 4th Company, which defended the Bridge of La Roux until Charleroi was taken, was too late to rejoin the latter, and therefore attached itself to the First Brigade, which was retreating by its Right Flank.
Lieutenant General Count Pajol's Corps of Light Cavalry formed the Advanced Guard of the Centre Column of the French Army: it was to have been supported by Vandamme's Corps of Infantry, but by some mistake, this General had not received his Orders, and at six o'clock in the morning had not quitted his bivouac. Napoleon, perceiving the error, led forward the Imperial Guards in immediate support of Pajol. As the latter advanced, the Prussian Outposts, though hard pressed, retired, skirmishing in good order. At Couillet, on the Sambre, about a mile and a half below Charleroi, the French Cavalry fell upon a Company of the 3rd Battalion of the 28th Prussian Regiment, surrounded it, and forced it to surrender.