Allied pursuit On 1 February 1814, Prussian field marshal
Gebhard Leberecht von Blücher with 80,000 Allied troops from his own Army of Silesia and Austrian field marshal
Karl Philipp, Prince of Schwarzenberg's
Army of Bohemia defeated
Napoleon and 45,000 French soldiers in the
Battle of La Rothière. This setback seriously shook the French army's morale. Each side suffered about 6,000 casualties but the Allies captured 50–60 artillery pieces. The Allies were delighted by their victory, though it might have been more complete if all their reserves had been committed to the battle. At this time, the Allied generals made the questionable decision to separate their armies. Blücher's army would advance from
Châlons-sur-Marne toward Meaux while Schwarzenberg's army operated on a more southerly route from
Troyes toward
Paris. On 3 February, Napoleon's army reached Troyes after completely breaking contact with the Allies the previous day. On 4 February, Schwarzenberg wrote his colleague Blücher that he was moving farther south in order to turn Napoleon's right flank. The next day, Russian General
Michael Andreas Barclay de Tolly ordered Alexander Nikitich Seslavin's scouting force from Schwarzenberg's right flank to the left flank without notifying Blücher. Since the Prussian field marshal did not have a liaison officer with Seslavin's force he did not realize that no one was watching for French forces in the space on his left flank. Also on 5 February, Napoleon decided to abandon Troyes and fall back to
Nogent-sur-Seine. He planned to contain Schwarzenberg with part of his army while attacking Blücher. Having prepared for a grand assault on Troyes, Schwarzenberg found the place empty of French troops on 7 February. He decided to let his troops rest for the next two days. Meanwhile, Napoleon reorganized his cavalry into the
I Cavalry Corps under
Étienne Tardif de Pommeroux de Bordesoulle,
II Cavalry Corps led by
Antoine-Louis Decrest de Saint-Germain,
V Cavalry Corps commanded by
Édouard Jean Baptiste Milhaud,
VI Cavalry Corps directed by
François Etienne de Kellermann and an independent division under
Jean-Marie Defrance. The French emperor created a new
VII Corps from two divisions transferred from the Spanish front and put Marshal
Nicolas Oudinot in charge. At the end of January a 10,000–11,000-man French corps under Marshal
Jacques MacDonald approached from the north. Supposing that Schwarzenberg's maneuvers would draw Napoleon away from his Army of Silesia, Blücher focused on destroying MacDonald's corps. During the first week of February, the Prussian field marshal ordered
Ludwig Yorck von Wartenburg's corps to pursue MacDonald along the main highway in the
Marne River valley. Hoping to trap the French corps, Blücher sent
Fabian Gottlieb von Osten-Sacken's corps along the more direct road through
Montmirail and
La Ferté-sous-Jouarre. Trying to accomplish two strategic goals at once, the Prussian army commander hung back to allow the newly arrived corps of
Peter Mikhailovich Kaptzevich and
Friedrich von Kleist to catch up with him. Blücher utilized
Zakhar Dmitrievich Olsufiev's small corps to link the two parts of his army. On 8 February, Sacken's cavalry reached
Viels-Maisons while his infantry was to the east at Montmirail. Olsufiev's corps was farther east at
Étoges while Blücher established his headquarters another east at
Vertus. Kaptzevich and Kleist were east of their army commander in Châlons-sur-Marne. Yorck's corps was in the Marne valley at least to the north, separated by bad roads. The Army of Silesia was now spread across a front of . Blucher assumed that Seslavin would report any danger coming from the south. That night, when his
Cossacks were driven out of
Sézanne, Sacken did not bother to report the incident to Blücher. In fact, it was Napoleon's leading corps under Marshal
Auguste de Marmont.
French offensive Napoleon left 39,000 troops to contain Schwarzenberg's Army of Bohemia. The formations were Oudinot's VII Corps, Marshal
Claude Perrin Victor's
II Corps,
Étienne Maurice Gérard's Reserve of Paris,
Henri Rottembourg's Young Guard infantry division, Milhaud's V Cavalry Corps and smaller units. Napoleon's striking force numbered about 20,000 foot soldiers and 10,000 horsemen. Another authority agreed that the French army numbered 30,000 men and added that it was supported by 120 guns. The army was formed by Marshal
Michel Ney's two Young Guard infantry divisions, Marmont's
VI Corps, part of the
Imperial Guard cavalry, I Cavalry Corps and Defrance's cavalry division. Bringing up the rear at Nogent was Marshal
Édouard Mortier, duc de Trévise with two Old Guard infantry divisions. On 9 February, MacDonald slipped across the Marne at La Ferté-sous-Jouarre, just ahead of Sacken. That day, Kaptzevich and Kleist rendezvoused with Blücher at Vertus, Olsufiev marched west to
Champaubert, Sacken reached La Ferté-sous-Jouarre and Yorck was at
Château-Thierry. According to
Karl Freiherr von Müffling of Blücher's staff, the Army of Silesia counted 57,000 men, including Sacken's 20,000, Yorck's 18,000 and Kaptzevich, Olsufiev and Kleist with a combined 19,000. Marmont's cavalry advance guard appeared at
Talus-Saint-Prix on the
Petit Morin River. Because the horsemen soon withdrew, Blücher's
chief of staff August Neidhardt von Gneisenau believed they represented no danger. When Schwarzenberg asked the Prussian field marshal to support his right flank corps under
Peter Wittgenstein, Blücher ordered Kaptzevich and Kleist to march southwest to Sézanne the next day. Olsufiev was ordered to march south from Champaubert. That night, Blücher finally received news that Napoleon was at Sézanne. Nevertheless, Gneisenau authorized Sacken to continue the pursuit of MacDonald to the west. Napoleon's soldiers plodded along roads deep in mud from days of rain. The men had to suffer hunger pangs when the provision wagons failed to turn up. The bogged artillery was only brought forward when the rural inhabitants in large numbers helped haul the guns through the mud. At first the French population had resigned itself to the Allied invasion, but after suffering at the hands of the Russians and Prussians, the people were eager to assist the army. On 10 February, as Blücher accompanied the column of Kaptzevich and Kleist while it marched toward Sézanne, the sound of artillery began to rumble ominously to the right near Champaubert. ==Battle==