The Six Days Campaign (10–15 February 1814) was a final series of victories by the forces of Napoleon I of France as the Sixth Coalition closed in on Paris.
The Six Days Campaign was fought from 10 February to 15 February during which time Napoleon inflicted four defeats on Blücher's army in the Battle of Champaubert, the Battle of Montmirail, the Battle of Château-Thierry, and the Battle of Vauchamps. Napoleon managed to inflict 17,750 casualties on Blücher's force of 70,000 with his 40,000-man army.
By the start of 1814 the Sixth Coalition had defeated the French both in Germany (see German Campaign of 1813 ) and in Spain (see Peninsular War § End of the war in Spain, 1813–1814, and were poised to invade France from the North East and South West.
On the North Eastern front thee Coalition armies were preparing to invade France, however by the time that Six Days' Campaign ended only two armies had crossed the frontier into France:The Army of Bohemia or the Grand Army, with 200,000–210,000 Austrian soldiers under Prince Schwarzenberg, passed through Swiss territory (violating the cantons' neutrality) and crossed the Rhine between Basel and Schafhausen on 20 December 1813.
The Army of Silesia, with 50,000–75,000 Prussians and Russians under Prince Blücher, crossed the Rhine between Rastadt and Koblenz on 1 January 1814.
At the same time Wellington invaded France over the Pyrenees. Leaving Marshals Soult and Suchet to defend south-west France, Napoleon commanded the French resistance in North East France.
Napoleon had about 200,000 men in all, of whom upwards of 100,000 were held by the Duke of Wellington on the Spanish frontier (see Invasion of south-west France), and 20,000 more were required to watch the debouches from the Alps. Hence less than 80,000 remained available for the east and north-eastern frontier. If, however, he was weak in numbers, he was now operating in a friendly country, able to find food almost everywhere and had easy lines of communication.
The fighting in north-east France was indecisive during January and the first week of February. Napoleon won the Battle of Brienne (29 January 1814) but only succeeded in driving Blücher a few miles east. On 2 February Napoleon engaged Schwarzenberg's Austrian army at the Battle of La Rothière. It was fought in appalling weather, with snow flurries and drifts that hampered movement. Although the French won the battle they were unable to capitalise on their victory. Napoleon retired to Lesmont, and from there to Troyes, Marshal Marmont being left to observe the enemy.
Owing to the state of the roads, or perhaps to the extraordinary lethargy which always characterized Schwarzenberg's headquarters, no pursuit was attempted. But on 4 February Blücher, chafing at this inaction, obtained the permission of his own sovereign, King Frederick III Prussia, to transfer his line of operations to the valley of the Marne; Pahlen's corps of Cossacks were assigned to him to cover his left and maintain communication with the Austrians.
Believing himself secure behind this screen, Blücher advanced from Vitry along the roads leading down the valley of the Marne, with his columns widely separated for convenience of subsistence and shelter the latter being almost essential in the terrible weather prevailing. Blücher himself on the night of 7/8 February was at Sézanne, on the exposed flank so as to be nearer to his sources of intelligence, and the rest of his army were distributed in four small corps at or near Épernay, Montmirail and Étoges; reinforcements also were on their way to join him and were then about Vitry.
In the night Blücher's headquarters were again surprised, and Blücher learnt that Napoleon himself with his main body was in full march to fall on his scattered detachments. At the same time he heard that Pahlen's Cossacks had been withdrawn forty-eight hours previously, thus completely exposing his flank. He himself retreated towards Étoges endeavouring to rally his scattered detachments.
Napoleon was too quick for Blücher: he decimated Lieutenant General Olssufiev's Russian IX Corps at the Battle of Champaubert (10 February). There were 4,000 Russian casualties and Russian General Zakhar Dmitrievich Olsufiev taken prisoner, to approximately 200 French casualties.
This placed the French army between Blücher's vanguard and his main body. Napoleon turned his attention to the vanguard and defeated Osten-Sacken and Yorck at Montmirail on 11 February; There were 4,000 Coalition casualties, to 2,000 French casualties. Napoleon attacked and defeated them again the next day at the Battle of Château-Thierry. There were 1,250 Prussian, 1,500 Russian casualties and nine cannons lost, to approximately 600 French casualties.
Napoleon then turned on the main body of the Army of Silesia and on 14 February defeated Blücher in Battle of Vauchamps near Étoges, pursuing the latter towards Vertus. There were 7,000 Prussian casualties and 16 cannons lost, to approximately 600 French casualties.
These disasters compelled the retreat of the whole Silesian army, and Napoleon, leaving detachments with marshals Mortier and Marmont to deal with them, hurried back to Troyes.
David Zabecki wrote in Germany at War (2014):
Later commentators noted that in this campaign Napoleon achieved unexpected and extraordinary results, including the elimination of approximately 20,000 enemy troops, which nearly halved the forces he then faced. Napoleon's troops had been greatly outnumbered, and he therefore fought by means of careful tactical manoeuvring, rather than using the sort of brute force characteristic of earlier French victories.
But the campaign rallied the Allies and helped end their internal bickering.
Michael Liggiere in Blücher: Scourge of Napoleon (2014) quotes Johann von Nostitz that the campaign displayed Napoleon's "talents as a field commander to the highest degree in defeating five enemy corps in sequence", but in failing to totally destroy Blücher army and driving the remnants back into Germany, Napoleon missed his only opportunity of forcing the Coalition Powers to agree to anything other than peace on their terms.
Napoleon inflicted further defeats on both Schwarzenberg's and Blücher's armies. Thus after six weeks fighting the Coalition armies had hardly gained any ground. The Coalition generals still hoped to bring Napoleon to battle against their combined forces. However, after Battle of Arcis-sur-Aube on 20 March, where the Austrians outnumbered his dwindling army 80,000 to 28,000, Napoleon realised that he could no longer continue with his current strategy of defeating the Coalition armies in detail and decided to change his tactics. He had two options: he could fall back on Paris and hope that the Coalition members would come to terms, as capturing Paris with a French army under his command would be difficult and time-consuming; or he could copy the Russians and leave Paris to his enemies (as they had left Moscow to him two years earlier). He decided to move eastward to Saint-Dizier, rally what garrisons he could find, and raise the whole country against the invaders and attack their lines of communications.
A letter containing an outline of his plan of action was captured by his enemies. The Coalition commanders held a council of war at Pougy on the 23 March and initially decided to follow Napoleon, but the next day Tsar Alexander I of Russia and King Frederick of Prussia along with their advisers reconsidered, and realising the weakness of their opponent, decided to march to Paris (then an open city), and let Napoleon do his worst to their lines of communications.
The Coalition armies marched straight for the capital. Marmont and Mortier with what troops they could rally took up a position on Montmartre heights to oppose them. The Battle of Paris (1814) ended when the French commanders, seeing further resistance to be hopeless, surrendered the city on 31 March, just as Napoleon, with the wreck of the Guards and a mere handful of other detachments, was hurrying across the rear of the Austrians towards Fontainebleau to join them.
Napoleon was forced to announce his unconditional abdication and sign the Treaty of Fontainebleau. Napoleon was sent into exile on the island of Elba and Louis XVIII became king. The Treaty of Paris, signed by representatives of the French monarchy and the Coalition powers, formally ended the War of the Sixth Coalition on 30 May 1814.