A fortnight before the battle, this water-course had offered him an impregnable position, which he had spurned to risk a general engagement in open country, putting behind him three rivers and a large town, which presented obstructions at every step!… The great captain had relied too much on his "star" and on the incapacity of the enemy generals.
In the event, they made such serious mistakes that in spite of an immense superiority in numbers, they were not only unable, during a battle lasting three days, to take from us a single one of the villages we were defending, but I have heard the King of Belgium, who was then serving with the Russian army, say to the Duc d'Orleans that on two occasions the allies were in such confusion that the order for a retreat was given: but then the situation changed and it our army which had to submit to the fortune of war.
After crossing the Saale, Napoleon thanked and dismissed those officers and soldiers of the Confederation of the Rhine, who either from some sense of honour or from lack of opportunity were still in our ranks. He even carried magnanimity so far as to allow them to retain their arms, although he was entitled to treat them as prisoners of war, since their sovereigns had joined the forces of our enemies. The French army continued its retreat to Erfurt, without anything happening but an encounter at Kosen, where a single French division defeated an Austrian army corps, and took prisoner its commanding general the Comte de Giulay.
Led on always by the hope of a fighting return to Germany, and by the help which he would receive in such a case from the fortresses which he was now forced to leave behind him, Napoleon put a numerous garrison into Erfurt. He had left in Dresden 25,000 men, under the command of Saint-Cyr; at Hamburg 30,000 under Davout, and many strongholds on the Oder and the Elbe, manned in accordance with their importance; these garrisons made up a loss in manpower to add to that due to the forts of Danzig and the Vistula.
I shall not repeat what I have already said about the disadvantages of deploying too many of one's troops to man forts which one is forced to leave behind. I shall merely point out that Napoleon left in the forts of Germany 80,000 men, not one of whom returned to France until after the fall of the empire, which they might perhaps have prevented, had they been defending our frontiers.
The arsenal at Erfurt was able to make good the loss of our artillery. The Emperor, who up till now had borne his reverses with stoical resignation, was however upset by the departure of his brother-in-law, the King Murat, who, with the excuse that he was going to defend his kingdom of Naples, abandoned Napoleon, to whom he owed everything!… Murat, at one time so brilliant in war, had done nothing much during this campaign of 1813. It is certain that, although he was in our ranks, he was carrying on a correspondence with M. de Metternich, the prime minister of Austria, who, dangling before his eyes the example of Bernadotte, guaranteed, in the name of the allied sovereigns, the protection of his kingdom if he would join Napoleon's enemies. Murat left the French army at Erfurt and had scarcely arrived in Naples when he began preparations for war against us.
It was also at Erfurt that the Emperor learned of the audacious scheme of the Bavarians, his former allies, who, after deserting his cause, and joining with an Austrian Corps and several groups of Cossacks had set off under the command of General the Comte de Wrede, whose ambition it was not only to stop the French army, but to make it captive, along with its Emperor.
General de Wrede marching parallel to us but at two days distance had already reached Wartzbourg with 60,000 men. He detached 10,000 to Frankfort and with the remaining 50,000 he went to the little fort of Hanau in order to bar the passage of the French. General de Wrede, who had fought on our side in Russia, thought that he would find the French army in the deplorable state to which cold and hunger had reduced those retreating from Moscow by the time they reached the Beresina, but we soon showed him that in spite of our misfortunes, we still had soldiers in good heart, and quite capable of defeating Austro-Bavarians.
General de Wrede, who did not know that the troops which we had fought at Leipzig, though following, were a long way behind us, had become very bold and believed he could trap us between two fires. It was not possible for him to do so; though, as several enemy corps were trying to mount an attack on our right by going through the mountains of Franconia, while the Bavarians stood in front of us, the situation could have become serious.
Napoleon rose to the challenge and marched briskly towards Hanau, whose approaches are protected by thick forests and notably by the well-known pass of Gelnhausen, through which runs the river Kinzig. This river, whose banks are very steep, runs between two mountains which are separated by a narrow gap which allows the passage of the river, beside which has been made a fine main road, cut into the rock, and running from Fulde to Frankfort-on-main via Hanau.