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Waterloo campaign: Ligny through Wavre to Waterloo facts for kids

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Waterloo campaign: Ligny through Wavre to Waterloo
Part of The Waterloo campaign
Part of Belgium engraved by J. Kirkwood
A portion of Belgium with some places marked in colour to indicate the initial deployments of the armies just before the commencement of hostilities on 15 June 1815: red Anglo-allied, green Prussian, blue French
Date 17–18 June 1815
Location
From Ligny through Wavre to Waterloo in Belgium
Result The Prussian army retreats and the French advance
Belligerents
France France Kingdom of Prussia Prussia
Commanders and leaders
Napoleon, Marshal Grouchy Prince Blücher
Strength
French Army order of battle Prussian Army order of battle

On 16 June 1815, the French defeated the Prussians at the Battle of Ligny. The Prussians successfully disengaged and withdrew north to Wavre where they regrouped, and later advanced westward with three corps to attack the right flank of the French army at the Battle of Waterloo. The French were slow to exploit Ligny; Napoleon wasted the morning of 17 June with a late breakfast and touring the previous day's battlefield before organising a pursuit of the two Coalition armies. Napoleon and Marshal Michel Ney took the French reserves to pursue the Duke of Wellington's Anglo-allied army. Marshal Emmanuel de Grouchy was ordered to pursue and harry the Prussians and prevent them from regrouping.

Napoleon and Grouchy assumed that the Prussians were retreating towards Namur and Liège to take up a line on the river Meuse. On 17 June, Grouchy sent the bulk of his cavalry ranging in that direction as far as Perwez. From a 22:00 despatch to Napoleon, Grouchy still thought the Prussians were retreating north-east although by then he knew that two Prussian corps were heading north towards Wavre. From another despatch four hours later, Grouchy intended to advance to either Corbais or Wavre. However, at the end of 17 June his detachment was behind the Prussians, on the far side of the Dyle; Grouchy could neither prevent the Prussians at Wavre from moving to Waterloo, nor regroup with Napoleon on 18 June at Waterloo.

On the morning of 18 June, the remaining Prussians crossed the Dyle in and around Wavre and headed westwards towards Waterloo. Grouchy was at Sart-lez-Walhain when at about 11:30 he and his staff heard cannonades from the Battle of Waterloo, 23 kilometres (14 mi) to the northwest; a local notary gave them an accurate location of the source of the sound. There were no direct roads from Grouchy to the battle, but there was a road to Wavre, 13 kilometres (8.1 mi) away to the north-northwest. Grouchy moved on Wavre, arriving at 16:00. At the Battle of Wavre, the French defeated the Prussian rearguard, the Prussian III Corps commanded by Johann von Thielemann, which had been about to leave for Waterloo.

The Prussian advance to Waterloo was impeded by swollen streams, which turned their valleys into muddy swamps, in particular the small river Lasne close to Saint-Lambert. Napoleon neglected to screen his right flank and failed to detect the Prussian's approach. At around 17:00 on 18 June, the Prussian vanguard started to arrive at Waterloo in strength from the Wood of Paris; shortly after they were attacking the right flank of Napoleon's army.

Ligny to Wavre, 17 June

Prussian retreat from Ligny

La Dyle à Wavre (2)
The Dyle river in Wavre (early 20th century).

After the Battle of Ligny, Zieten's Prussian I Corps and Pirch I's II Corps retired to Tilly and Gentinnes.

On the night of 16 June, Prussian headquarters ordered the army to fall back to Wavre instead of falling back along lines of communication toward Prussia; by doing so, Field Marshal Gebhard Leberecht von Blücher retained the option of linking-up with the Anglo-allied army. I and II Corps were ordered to Bierges and Saint-Anne. Thielemann's III and Bülow's IV Corps at Gembloux and Baudecet [fr] received the order on the morning of 17 June to move and bivouac at Bawette [nl] and Dion-le-Mont [fr] near Wavre.

I and II Corps passed through Mont-Saint-Guibert. II Corps deployed as rearguard in a defile behind the settlement. I Corps arrived at Wavre around noon, crossed the Dyle, and took up positions at Bierges. II Corps followed, but took up position on the right bank of the Dyle, between Sainte Anne and Aisémont.

A cavalry brigade with half a horse battery, commanded by Lieutenant Colonel Eston von Sohr, from II Corps acted as rearguard for I and II Corps. It was ordered to take up a concealed position between Tilly and Gentinnes and observe French movements, and fall back to the defile at Mont-Saint-Guibert when engaged.

Also that night, Colonel von Röhl, superintendent of the army's Ordnance Department, set out for Wavre to organize any artillery arriving there for action. His aide-de-camp went to Gembloux to move the army's reserve ammunition wagons to Wavre. Additional precautions were taken. Urgents orders for ammunition were sent to Maastricht, Cologne, Wesel, and Münster. Orders went to Liège to move the siege train to Maastricht, and to destroy the iron foundry at the arsenal.

General Friedrich Wilhelm von Jagow's detachment had held Byre during the night. At first light on 17 June, it began moving to Gembloux by way of Sombreffe, and arrived before III Corps. After receiving the retreat order, Jagow directed the detachment's units back to their brigades.

Prussian III Corps joins IV Corps at Gembloux

Prussian III Corps remained in place for much of 16 June, which covered the retreat through Gembloux.

Blücher was recovering from his fall at the Battle of Ligny. It was Gneisenau, Blücher's chief-of-staff, who gave III Corps the option of retreating by Tilly or Gembloux. Thielemann chose Gembloux, as he knew that the French held Saint-Amand, Ligny, and the Ligny battlefield up to Sombreffe.

The widely dispersed III Corps regrouped during the night of 16 June; the manoeuvre was protracted. It was not until 02:00 on 17 June that the head of the column, made of the reserve artillery, reached the Nivelles–Namur/Fleurus–Gembloux crossroad and the Gembloux road. The corps' main body reached Gembloux at 06:00.

III Corps' rearguard - Borcke's 8th Infantry Brigade and Hobe's III Corps Cavalry (the reserve cavalry) - took up position along the Namur road, facing south down the Fleurus chaussée (high road) toward the French. The rearguard withdrew at 04:00.

IV Corps' vanguard reached Baudecet by the old Roman at nightfall on 16 June. Bülow learned of the Battle of Ligny, and ordered brigades posted at intervals along the road. Hake's 13th Brigade was bivouacked to the rear, near Hotomont [fr] where the road intersected with the Namur-Louvain road. In the morning, IV Corps was posted about 4.8 kilometres (3 mi) to the rear of Grembloux on the Roman road.

As III Corps approached Gembloux, it learned of IV Corps' position. Major Karl von Weyrach, Blücher's aide-de-camp, and who had accompanied III Corps through the night, left to report the status of both corps to army headquarters; he found it at Mellery. III Corps halted on the other side of the town. Neither Thielemann nor Bülow knew where I and II Corps were. Writing to Bülow, Thielemann said that he had no new orders from Blücher, but believed the army was retreating to Saint-Trond. Furthermore, III Corps had not been followed by the French, but he had heard distant firing on the right, which he concluded was connected with Duke of Wellington's Anglo-allied Army.

With two corps available, the Prussians could contest a French pursuit toward Gembloux.

Cavalry skirmish along the Namur road

The Prussians were too far away to easily follow by the time the French organized a pursuit. The French detached Pajol and the 4th Cavalry Division of his light Cavalry Corps to pursue. The division, led by Pierre Soult, consisted of Clary's 1st, Blot's 4th, and Liégeard's 5th Hussars; they struck down the Namur road. They were supported by Lieutenant General Baron François Antoine Teste's 21st Infantry Division of Lobau's VI Corps, which took up position on the heights above Mazy.

4th Cavalry Division quickly encountered a Prussian force composed of Horse Battery No. 14 and a squadron of the 7th Uhlans. The horse battery, from II Corps, had retired during the Battle of Ligny after running out of ammunition but had not found the reserve ammunition wagons; it had neither returned to II Corps or withdrawn with III Corps, instead "uselessly driving first in one direction, and then in another". The Uhlans, from III Corps, had been posted at Onoz and had not received recall orders. The French captured all of the Prussian guns, with the Uhlans losing 30 men before escaping. The skirmish gave the French the impression that the Prussians were retreating toward Namur.

Prussian III Corps and IV Corps retreat to Wavre

At about 09:30, Weyrach arrived at IV Corps headquarters with orders from army headquarters for IV Corps to move to Dion-le-Mont, near Wavre, by Walhain and Corbais [fr] The orders also defined the corps' rearguard. The main body of the rearguard - ultimately 14th Brigade - was to be posted at Vieux-Sart. Furthermore, a detachment of a regiment of cavalry, two battalions of infantry, and two guns of horse artillery was to be sent to Mont-Saint-Guibert to reinforce, and then cover the withdrawal of, I and II Corps' rearguard; this detachment was commanded by Lieutenant Colonel Ledebur and composed of the 10th Hussars, the fusilier battalions of the 11th Regiment of Infantry and 1st Regiment of Pomeranian Landwehr, and two guns from Horse Battery No. 12.

The main body of the IV Corps moved directly to Dion-le-Mont. It took up position on the height near that town, near the intersection of the roads leading to Louvain, Wavre, and Gembloux.

III Corps began moving at 14:00; it arrived at Wavre late in the evening and took up positions at Bawette. General Borcke's 9th Infantry Brigade and Colonel Count Lottum's Cavalry Brigade remained on the right bank of the Dyle. Other units rejoined the main body at Wavre: Colonel Marwitz' Cavalry Brigade which had withdrawn through Tilly, the 2nd Battalion of the 3rd Kurmark Landwehr and the two squadrons of the 6th Kurmark Landwehr Cavalry from Dinant, and the survivors of the 7th Uhlans squadron from Onoz. The corps' two squadrons from the 9th Hussars had not yet arrived from Ciney.

Prussian headquarters retreats to Wavre

Prussian army headquarters relocated to Wavre early on 17 June. Blücher was still recovering from his injuries and remained bedridden for the rest of the day.

Late in the morning, Lieutenant Massow [de] made a round trip as messenger between the Prussians and the Anglo-allies. He notified the Anglo-allies that the Prussians were retreating to Wavre, and then returned with a message from Wellington for Blücher. Wellington intended to retreat to Waterloo, and requested the support of two Prussian corps so he could give battle. Blücher did not reply immediately. The request was viewed favourably but the Prussian army was still regrouping on Wavre and Blücher did not yet know what he could promise. It was not known if IV Corps would join the army on 17 June. I and II Corps needed ammunition, but its supply had been directed to Grembloux. For the moment, the Prussians maintained their position near the Dyle, with VI Corps at Mont-Saint-Guibert as vanguard.

0 Couture-Saint-Germain - Ancien palais abbatial de l'abbaye d'Aywiers
Abbey of Aywiers in the village of Couture-Saint-Germain.

During the day, Major Falkenhausen conducted reconnaissance toward Genappe from Céroux [fr]. He observed the French advance along the Genappe-Brussels high road from woods beyond Céroux. Prussian patrols were sent toward Lasne, Couture-Saint-Germain, and Aywiers [fr], to observe the defiles along the streams of the Lasne.

French reconnaissance and inactivity

The Prussian retreat, in good order and along routes where only minor roads (as opposed to high roads) were available, was met by French inactivity. At dawn on 17 June, French vedettes were within 0.80 kilometres (.5 mi) of Prussian III Corps' rearguard. The French did not conduct patrols, and missed the opportunity to observe the direction of the rearguard's withdrawal after sunrise. Pajol's detachment, perhaps suspecting Namur was not the direction of the Prussian retreat, went to Saint-Denis where it regrouped with the 21st Infantry Division. A brigade from Exelmans' Heavy Cavalry Corps was sent to reinforce Pajol's detachment; based on updated intelligence, it redirected en route to Gembloux and discovered traces of the Prussian retreat.

In the morning, Marshal Emmanuel de Grouchy, acting commander of the Right Wing of the French Army, travelled to meet Napoleon at the emperor's quarters at Fleurus; the marshal was responding to a summons from the previous evening. At 08:00 and 09:00, Napoleon, accompanied by Grouchy, started a tour of the surrounding area; he visited officers, troops, and the battlefield at Ligny. At one point, he had a lengthy conversation with Grouchy and Gérard - the commander of the IV Corps - about domestic politics and other subjects unconnected with the campaign.

French main army divides

Grouchy's detachment
Unit Commander Troops Guns
Infantry Cavalry Gunners Total
III Corps General Count Vandamme 14,508 0 936 32
IV Corps General Count Gérard 12,589 2,366 1,538 38
21st Division (VI Corps) Lieutenant General Baron Teste 2,316 0 161 8
4th Division (I Cavalry Corps) Lieutenant General Count Pajol 0 1,234 154 6
II Cavalry Corps Lieutenant General Count Exelmans 0 2,817 246 12
Initial strength 29,413 6,417 3,035 38,870 96
Losses on 16 June 3,900 800 400 5,100 0
Strength on morning of 17 June 25,513 5,617 2,635 33,765 96

By noon on 17 June, Napoleon had received reconnaissance reports toward Quatre Bras, and learned of the Prussian concentration at Gembloux. The army was divided between these two targets. He made the first changes to the disposition of the French army since sending Pajol's detachment to pursue the Prussians toward Namur.

For an attack on Quatre Bras, forces would stage in front of Marbais astride the Namur road. The assigned formations were:

  • Lobau's VI Infantry Corps, minus 21st Division which was supporting Pajol's detachment.
  • Milhaud's IV Cavalry Reserve Corps (a corps of Heavy Cavalry Cuirassiers), along with Lieutenant General Baron Subervie's Light Cavalry Division (detached from Pajol's I Cavalry Reserve Corps)
  • Lieutenant General Baron Domon's 3rd Light Cavalry Division (of II Corps)
  • Imperial Guard, both cavalry and infantry.

A detachment composed mainly of III Corps, IV Corps, and II Cavalry Corps was assigned to Grouchy to pursue the Prussians. This was sufficient to probe Prussian movements, maintain communication with the main French army, and affect withdrawal if sorely pressed; it was not meant to fight the entire Prussian army. 7th Infantry Division, commanded by Lieutenant General Girard, of II Corps had suffered heavy casualties the day before and was left at Ligny.

Napoleon's orders were:

"Pursue the Prussians, complete their defeat by attacking them as soon as you come up with them, and never let them out of your sight. I am going to unite the remainder of this portion of the Army with Marshal Ney's Corps, to march against the English, and to fight them if they should hold their ground between this and the Forest of Soignies. You will communicate with me by the paved road which leads to Quatre Bras."

The Prussian's main line of retreat was still unknown to the French. Napoleon believed the Prussians were retreating toward Namur and Liège, and to a line on the Meuse. From there, the Prussians could threaten the right flank of a French advance on Brussels. Grouchy believed pursuit was not worthwhile as the Prussians were now many hours ahead of the French, having started to retreat at 22:00 the previous night; he could not convince Napoleon to allow him to go to Quatre Bras with the main French army.

Once arrangements with Grouchy were complete, Napoleon ordered the army at Marbais to advance. 5th Light Cavalry Division acted as vanguard, and the French reached Quatre Bras at about 14:00. By that time, the infantry of the Anglo-allied army had crossed the Dyle and were retreating along high road to Brussels. The French engaged the covering Anglo-allied cavalry.

Prussian rearguard retreats to Mont-Saint-Guibert

French movement through Byre toward Quatre Bras was observed by Sohr's Prussian I/II Corps rearguard. Sohr retained a cavalry brigade, which was held to the rear of Tilly. Shortly afterward, the Prussians began slowly pulling back to Mont-Saint-Guibert in response to the approach of French dragoons from Exelmans' II Cavalry Corps. The French skirmishers slowed the Prussians by forcing them to take frequent precautions against attack; the French abandoned the chase as night fell. Ledebur's IV Corps rearguard was waiting at Mont-Saint-Guibert when Sohr's detachment arrived in the evening of 17 June; Ledebur passed on orders to defend the defile.

Grouchy advances to Gembloux

After Napoleon's departure, Grouchy ordered III and IV Corps to move to junction of the Gembloux and Namur roads and then - after receiving reports of significant Prussian movement through Gembloux - onto Gembloux. In the meantime, Grouchy went to the advanced posts of Exelmans' dragoons, which were now beyond Gembloux. III and IV Corps reached Gembloux very late in the evening; III Corps was posted in front, and IV Corps to the rear, of the town. 6th Light Cavalry Division, commanded by Brigadier General Louis Vallin after Lieutenant General Antoine Maurin was wounded at the Battle of Ligny, was stationed nearby on the right bank of the Orneau.

The 1st Brigade of Lieutenant General Chastel's 10th Cavalry Division, consisting of the 4th and 12th Dragoons, under Brigadier General Bonnemain, was pushed on to Sart-lez-Walhain. 15th Dragoons, from General Vincent's [fr] Brigade of the 9th Cavalry Division, under Lieutenant General Baron Strolz), were detached to Perwez. These units reported that the Prussians had retired toward Wavre.

21st Infantry Division, accompanied by Pajol's cavalry detachment, returned to its morning starting position of Mazy from Saint-Denis. Siborne states that there was no satisfactory explanation for this movement.

Grouchy wrote a despatch to Napoleon dated 10:00 on 17 June. He gave his disposition around Gembloux, and a less accurate assessment of Prussian movements. According to Grouchy, from Sauvenières one Prussian column went to Wavre, perhaps to link up with the Anglo-allies, while the main Prussian body went to Perwez en route to Liège. Finally, a column of Prussian artillery went to Namur. Grouchy reported he would follow the main Prussian body, which at that time seemed like either to Wavre or Perwez. Siborne states that the despatch "was well calculated to satisfy Napoleon, that at least the spirit of his instructions had been understood by the Marshal."

At 02:00 on 18 June, Grouchy sent another to Napoleon reporting that he would advance upon either Corbais or Wavre.

Prussians regroup at Wavre

At 17:00 on 17 June, the Prussian reserve ammunition wagons reached Wavre, and the army was resupplied. By the evening, the Prussian army was positioned around Wavre. Two corps were on each side of the Dyle and ready to resume operations. The rearguards remained at Vieux-Sart and Mont-Saint-Guibert, and withdrew without difficulty the next day. The only units still in transit were Borcke's 9th Brigade, Hacke's 13th Brigade, and Hobe's reserve cavalry from III Corps.; they arrived in Wavre by 06:00 the next day. Patrols were sent toward the main Namur-Louvain road, and up the river to maintain contact with the rearguard at Mont-Saint-Guibert. A detachment from I Corps provided flank protection at Limal.

The defiles of the Lasne were patrolled during the evening.

According to William Siborne, morale and confidence in Blücher's leadership remained high.

With preparations completed, Blücher replied to Wellington's request for reinforcements. Blücher pledged the support of his entire army. His only condition was that the Coalition would attack on the 19th if the French did not attack first on the 18th. Before midnight, Blücher was notified by a despatch from General Karl Freiherr von Müffling - attached to the Anglo-allied headquarters - that the Anglo-allied army was deployed at Waterloo - from Braine l'Alleud on the right to near La Haye on the left - and awaiting the arrival of the French army and Prussian reinforcements.

From midnight, the army received orders for the advance on Waterloo. IV Corps, followed and supported by II Corps, would advance to Chapelle-Saint-Lambert at dawn; they would attack the French right flank if serious fighting had already started, otherwise they were to conceal their strength. IV Corps would leave an observation detachment at Mont-Saint-Guibert, which would gradually fall back to Wavre if attacked, and send any baggage unnecessary for the battle to Louvain. I and III Corps would be ready to follow IV Corps if necessary. The plan was despatch to Müffling - to forward to Wellington - with an explanation that troop fatigue prevented earlier movement.

The Coalition armies were ready to link-up at Waterloo on 18 June, unlike the main French army and Grouchy's detachment.

Wavre to Waterloo, 18 June

Grouchy chooses Wavre instead of Waterloo

The French began moving on Wavre on the morning of 18 June.

At 05:00, Pajol's cavalry detachment and 21st Infantry Division set out from Mazy for Saint-Denis and Grand-Leez [fr], to Tourinnes where they awaited further orders.

Grouchy's detachment also started moving. The Heavy Cavalry Corps, consisting of eight regiments of dragoons, set out at around 08:00. III and IV Corps began moving along the same road through Sart-lez-Walhain, toward Wavre at around 09:00; the corps' left flank was protected by the 6th Light Cavalry Division, which advanced toward the Dyle. III and IV Corps' march was slowed by poor roads, and narrow and miry defiles. Gérard, going ahead of IV Corps, arrived at Sart-lez-Walhain at 11:00, where he found Grouchy taking breakfast in the house of M. Hollaëbt, a notary.

At around 10:30, Heavy Cavalry Corps' vanguard met the Prussian rearguard on the road to Wavre. The French cavalry formed a 3.2 kilometres (2 mi) line from a wooded ravine near the Farm of La Plaquerie, to a point about 0.5 kilometres (0.31 mi)) south of Vieux-Sart toward Neuf-Sart. As skirmishers engaged, Exelmans sent Chef d'Escadron d'Estourmel to update Grouchy and advise that the Prussians had retreated toward Wavre during part of the night and morning for closer communication with the Anglo-allies.

At about 11:30, Colonel Simon Lorière - Grouchy's chief of staff - heard a distant but violent cannonade coming from Waterloo while walking in the garden, and notified Grouchy. Grouchy went into the garden with several officers, including Gérard, Vandamme, Exelmans. Hollaëbt was summoned and asked to identify the direction of the sound; he pointed to the Forest of Soignies and replied that it was coming from the vicinity of Plancenoit and Mont-Saint-Jean.

Gérard favoured moving immediately toward the sound to better support Napoleon, and volunteered IV Corps. General Baltus of the artillery disagreed, perhaps worried by the difficulties of moving the guns. General Valaze, commanding the engineers of Gérard's corps, initially agreed with Baltus but noted that he had three companies of sappers to remove obstacles, which gave Gérard confidence that guns carriages and limbers could be moved.

Grouchy was determined to follow Napoleon's instructions to prosecute the Prussians, and rejected Gérard's strategy. Grouchy believed his detachment had just encountered the rearguard of the Prussian infantry. Furthermore, Blücher's intentions were unclear; the Prussians could decide to fight at Wavre, or continue retreating toward Brussels, or - if attempting to join the Anglo-allies - move in front or behind of the Forest of Soignies. The detachment would go to Wavre. Grouchy justified his decision after the campaign. Fundamentally, he saw his responsibility as the execution Napoleon's instructions; sending even a part of the detachment toward Forest of Soignies would have been in contravention of those orders. Furthermore, it would have been difficult for separated parts of the detachment to support each other near the Dyle; the river was swollen by rain and its banks were swampy.

As Grouchy moved to join the vanguard, he received a message from Napoleon that confirmed his decision. The message, written at the Farm of Caillou on 18 June at 10:00 from, warned of the impending attack on the Anglo-Allied army at Waterloo, and instructed Grouchy to move toward Napoleon from Wavre and to maintain close communication. Grouchy did not act immediately on the new instructions. No measures were taken to either detect possible Prussian movement toward Waterloo, or establish closer communication with the main French army. Grouchy conducted a direct advance on Wavre. The left flank was neglected. The Heavy Cavalry Corps was ordered to take up position on the right at Dion-le-Mont [fr], with its position taken over by 6th Light Cavalry Division.

Prussians depart for Waterloo

Before dawn, Major Witowsky led a detachment from the 2nd Silesian Hussars to Maransart to scout the defiles of the Lasne, and the area beyond toward the French; they encountered a French patrol at Maransart. Falkenhausen also send reconnaissance parties to the Lasne, which also maintained communication with the detachment at Mont-Saint-Guibert; they found the defiles free of the French. French movement between the Dyle and the Charleroi high road was accurately observed and reported. The Prussian patrols forced French messengers to avoid the area, thus lengthening the line of communication between the main French army and Grouchy's detachment.

At daybreak on 18 June, Prussian IV Corps began to move from near Dion-le-Mont to Saint-Lambert through Wavre. The vanguard consisted of General Losthin's [de] 15th Brigade, the 2nd Silesian Hussars, and a twelve pounder battery. The vanguard reached Saint-Lambert by 11:00, then crossed the soft and muddy valley before halting in the Wood of Paris. Hussar patrols went to scout the Anglo-allied and French eastern flanks.

A Prussian patrol with a staff officer made contact with a squadron of the British 10th Hussars, commanded by Captain Taylor, posted at Smohain. The staff officer had a report for Wellington, which Taylor ordered relayed by Lieutenant Lindsey. The report stated that Bülow was at Saint-Lambert and was advancing with IV Corps, although this was an overstatement as only the corps' vanguard had reached Saint-Lambert at the time.

The remainder of IV Corps was delayed by a fire that broke out in Wavre after the vanguard passed. The fire spread rapidly and put ammunition wagons at risk. The 1st Battalion of the 14th Regiment, under Major Löwenfeld, and the 7th Pioneer Company extinguished the fire. Hiller's [de] 16th and Hacke's 13th Brigades arrived at Saint-Lambert much later than the vanguard. The rearguard, the 14th Brigade, was even farther behind.

Blücher acted immediately upon learning that the right flank of the main French army was exposed, seeing the opportunity to move his army through the Lasne defiles to the Wood of Paris.

I Corps was ordered to depart after V Corps passed through Wavre. It would march by way of Fromont and Ohain and join the Anglo-allied left at La Haye; I Corps set out at about 12:00 along the left bank of the Dyle.

II Corps was ordered to follow IV Corps to Saint-Lambert.

III Corps would remain for a time as rearguard in the defile of Wavre, and then follow II Corps. Blücher intended to have the bulk of the army past the defiles of Saint-Lambert before abandoning Wavre.

At 09:30, Blücher send a despatch informing Wellington that he intended to attack the French right flank as soon as possible. Blücher left Wavre before 11:00 to reconnoitre the terrain toward Saint-Lambert from near Limale.

French attack Wavre

French cavalry penetrated between the Prussian rearguard at Vieux-Sart and Mont-Saint-Guibert when Prussian IV Corps' Reserve Cavalry - following the corps' 13th Infantry Brigade - was passing through Wavre. The Reserve Cavalry immediately detached two regiments - the 2nd Pomeranian, and the 1st Silesian of the Landwehr Cavalry - to counter the French advance. Ledebur's Prussian detachment at Mont-Saint-Guibert began falling back to Wavre upon learning of the French advance. Sohr's Prussian detachment, which had withdrawn from Mont-Saint-Guibert in the morning, sent a brigade of 150 cavalry and two horse artillery guns to reinforce Ledebur. Ledebur's detachment linked up with the IV Corps' Reserve Cavalry regiments and Sohr's cavalry brigade; they reached Farm de Auzel after a "slight affair" with French III Corps.

Around noon, Prussian II Corps began moving from between Saint-Anne and Aisémont, on the right bank of the Dyle, through the defile toward Wavre for a river crossing. Progress was slow as the corps crowded into the defile. At Wavre, the garrison of 1st Battalion of the 14th Regiment, II Corps, was relieved by a battalion of the 30th Regiment, Prussian III Corps.

While underway, II Corps was notified by Sohr's detachment - the corps rearguard - of the French advance consisting of six cavalry regiments of, ten artillery pieces, and two strong columns of infantry. By this time, the Wood of Sarats, close to the Farm of Auzel, was occupied by battalions of the 8th Brigade, II Corps, commanded by Colonel Reckow. Pirch put General Brause, commander of the 7th Brigade, in command of the rearguard, and reinforced Sohr's detachment with the 11th Hussars and four pieces of horse artillery. Brause posted the remaining battalions of the 8th Brigade in rear of the wood, the three cavalry regiments on the right, and Foot Battery No. 12 in front. The 7th Brigade, deployed into line, remained in reserve.

The French "did not advance with much vigour" and the Prussian's withdrew in perfect order. Ledebur's detachment withdrew slowly before the French and linked up with 8th Brigade; 8th Brigade maintained position until 15:00 against the vanguard of French III Corps. General Brause ordered the retreat between 15:00 and 16:00. Sohr's detachment and then the II Corps reserve cavalry regiments crossed the bridge at the Mill of Bierges, which was occupied by two companies of the 2nd Battalion, 14th Regiment. Sohr's detachment only rejoined II Corps at Waterloo. The Fusilier Battalion of the 1st Pomeranian Landwehr, commanded by Major Krüger, distinguished itself during the withdrawal. After the river crossing was completed, the 1st Battalion of the Elbe Landwehr remained at Bierges until the bridge was destroyed and the mill set on fire. The 11th Hussars and the 2nd Battalion of the Elbe Landwehr remained to observe the Dyle crossings and did not rejoin their corps before the following day.

Blücher learned of the French advance on Wavre while near Limale. He ordered Prussian III Corps to hold Wavre against a strong French attack; the strength of Grouchy's attacking French detachment was unknown to the Prussians. If the French crossed the Dyle upstream or did not attack in strength, III Corps was to leave a few battalions in the town and rejoin the main army in the direction of Couture-Saint-Germain as the reserve. The order was relayed by Colonel Clausemotz, Chief of the Staff of III Corps. Vandamme's French III Corps attacked Wavre at 16:00 as Prussian III Corps was leaving Wavre.

Prussians advance to the Wood of Paris

Plate J from 'An Historical Account of the Campaign in the Netherlands' by William Mudford (1817)
Châteaux Frischermont, shortly after the Battle of Waterloo.

A detachment of the 2nd Silesian Hussars and staff officer Major Lützow, was sent to scout the right front of the Prussian advance in the direction of the French right flank at Waterloo. They reached the Wood of Paris and discovered that the French right flank was completely exposed. A Prussian troop of Hussars advanced beyond the Wood of Paris to near Frischermont, where it had a good view of the Waterloo battlefield; the troop also did not encounter any French forces.

The Prussians had the opportunity to quickly occupy the Wood of Paris. Lützow, on his way to report to Blücher met General Grolman, the Quartermaster General of the Army. Grolman ordered the Silesian Hussars and two battalions of infantry from Bülow's vanguard - the units having just crossed the defile of Saint-Lambert - to immediately take the wood, and sent a despatch to Blücher suggesting that the 15th and 16th Brigades be ordered to follow the vanguard once they had regrouped on the Waterloo side of the defile.

The march through the defile of Saint-Lambert was difficult and exhausting. Rainfall, starting during the afternoon of 17 June and continuing through the night, had turned the valley of the Lasne into a swamp. The roads between Wavre and Saint-Lambert were similarly affected. The columns were drawn out for miles due to frequent stoppages and breaks. Blücher travelled along the line of march to provide encourage. By 16:00, after considerable difficulty and delay, the 15th and 16th Brigades, and the reserve cavalry and artillery, had reached the plateau between the Lasne and the Smohain. The plateau sloped steeply downwards toward the streams, but its high ground was comparatively dry and firm and suitable for marching.

Monument au comte von Schwerin 02
The Monument to Colonel Count von Schwerin [de].

At the Wood of Paris, the Prussians deployed along a considerable front in a close compact order, on each side of the road leading from Lasne towards Plancenoit. The artillery kept to the road. The cavalry drew up to the rear of the wood to follow the infantry. 15th Brigade deployed at around 15:00, and shortly afterwards its cavalry screen skirmished with a French patrol in which Colonel Schwerin [de] was killed. Schwerin may have been the first Prussian officer killed at the Battle of Waterloo; a memorial now marks the site.

Blücher observed the "tremendous cannonade", the renewed French attack at 16:00, and the French reserves behind La Belle Alliance preparing for another attack; he feared that the Anglo-allied line might break if the Prussians waited. Wellingon's frequent and pressing despatches added urgency. Blücher had planned to attack with II and IV Corps (13th and 14th Brigades from IV Corps were expected to join shortly, and II Corps was following along the same line.) Instead, he decided to attack with only what was at the Wood of Paris, and ordered units still on the march to join as quickly as possible.

The Prussian direction of attack was perpendicular to the right flank of the French Army and the Charleroi road, which was the French main line of operation.

At 16:30, 15th and 16th Brigades debouched in typical Prussian brigade formation. 15th Brigade deployed on the right, detaching three battalions (2nd Battalion of the 18th Regiment, the 3rd Battalion of the 3rd Silesian Landwehr, and the 1st Battalion of the 18th Regiment) toward Frischermont and Smohain to cover the right flank. 16th Brigade deployed on the left, with two battalions (3rd battalions of the 15th Regiment and the 1st Silesian Landwehr) under Major Keller to cover the left flank to the Lasne stream. 100 cavalry from the 3rd Regiment of Silesian Landwehr Cavalry, led by Falkenhausen, patrolled beyond the Lasne.

Prussians advance from the Wood of Paris

During the march from Genappe to La Belle Alliance, the main French army had detached Domon's 3rd Cavalry Division eastward to scout the area between the high road to Brussels and the Dyle. Desmichels' 4th Regiment of Chasseurs pushed as far as the bridge at Mousty, where its skirmishers exchanged a few carbine shots with some Prussian dragoons, who did not engage further them further. This allowed Napoleon to surmise that the principal Prussian column - of I and II Corps - had retreated through Tilly and Gentinnes; Grouchy was still unaware of this.

Blücher ordered a cannonade against Domon's detachment, which was forming up en potence at a considerable distance from the Prussian vanguard; this was primarily to announce the Prussian presence and draw French attention away from the Anglo-allies. Domon's entire line advanced to attack, led by a regiment of chasseurs. The Prussian's 2nd Silesian Hussars and the 2nd Neumark Landwehr Cavalry moved forward through the infantry and attacked with the Hussars on the left and the Landwehr on the right; the Prussian cavalry, supported by the 3rd Silesian Landwehr Cavalry, attacked and drove back the chasseurs before retreating to avoid being flanked by the advancing French line. The Prussian cavalry were covered by Horse Battery No. 11, and Captain Schmidt's Foot Battery of the 15th Brigade which drew up to oppose a French pursuit. The French declined to follow up their attack because of the Prussian battery fire and the advancing Prussian infantry.

By now, the battalions of Prussian 15th Brigade's flank guard of had reached Smohain. They had advanced so cautiously that their appearance from the south-eastern part of the village surprised both nearby Anglo-allied and French troops. The Prussian battalions crossed the principal fence separating them from the French extreme right, and at 17:30 drew up in line almost at right angles with the direction of the French front — two battalions in line, with the third in support; this marked the full engagement of the Prussians at the Battle of Waterloo.

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