During the winter of 1812 and the spring of 1813 Buonaparte was making the most energetic exertions to renew the campaign against Russia and the German nations that were now uniting with the Czar. He called out new conscriptions, and enforced them with the utmost rigour; the militia were drafted extensively into the regular army, and the sailors, whose service had been annihilated by the victorious seamen of Great Britain, were modelled into regiments, and turned into soldiers. He sent for part of his forces from Spain; and in the spring he was enabled to present himself in Germany at the head of three hundred and fifty thousand men. But this was a very different army from that which he had led into and lost in Russia—an army of practised veterans, familiar with victory through a hundred fights. It was necessarily but ill-disciplined, and much more full of the sense of wrong in having been dragged from home and its ties than of any thirst of glory. The cavalry was especially defective, and had lost the commander who gave it such spirit by his own example. Disgusted by the insolence and sarcasms of Buonaparte, and believing that his career was about to end, Murat quitted his command on the 16th of January, 1813, and hastened to Naples, where he was not long in opening negotiations with Great Britain and the other Powers for the acknowledgment of his kingdom as one independent of France, and ranking with the other established Powers of Europe. Nor was this the only alarming circumstance. Bernadotte was at the head of an army of Swedes against him—Bernadotte whom he had driven by the same insolent and unbearable domination into the arms of his enemies, and whom he now denounced as a renegade Frenchman who had renounced his country. The truth, however, was that Bernadotte had been adopted by a new country, and was bound to defend it.

Next came the declaration of war by the King of Prussia, which Buonaparte styled a treachery; but, on the contrary, the King of Prussia had only preserved faith towards his oppressor and insulter too long. Not only all Prussia, but all Germany was on fire to throw off the detested yoke of the oppressor, and Frederick William would have been a traitor to his people and to common sense to have hesitated. Yet he proposed terms of a mutual settlement. To place himself in a position of independent treaty, he suddenly left Berlin on the 22nd of January, and made his way to Breslau, where he was out of the reach of French arms, and in certainty of the arrival, at no very distant date, of Russian ones. He invited, however, the French ambassador to follow him, and he there proposed an armistice, on the conditions that the French should evacuate Dantzic and all the other Prussian fortresses on the Oder, and retire behind the Elbe, on which the Czar had promised that he would stop the march of his army beyond the Vistula. But Buonaparte treated the proposition with contempt; he was determined to give up nothing—to recover everything.

Immediately on the rejection of his terms Frederick William concluded a treaty with Alexander on the 28th of February, and Austria was invited to join the league. Alexander had joined his army himself on the 22nd of December, and had marched along with it through that horrible winter. On the 1st of March Prussia concluded its alliance with Alexander, offensive and defensive. On the 15th Alexander arrived at Breslau, and there was an affecting meeting of the two sovereigns, who had been placed in outward hostility by the power of Buonaparte, but who had never ceased to be friends at heart. The King of Prussia was moved to tears. "Courage, my brother," said Alexander; "these are the last tears that Napoleon shall cause you."

The next day the war against France was proclaimed, and for the righteous cause of restoring the independence of the nations. Prussia, and indeed all Germany, had now been trampled on sufficiently to crush the effeminacy out of all classes—to rouse the true soul of liberty in them. Men of every rank offered themselves as the defenders and avengers of their country; the students at this moment not only sung, but aided freedom. The volunteers were formed into Black Bands, and others assumed the dress and arms of the Cossacks, who had won much admiration. They were disciplined in the system of Scharnhorst, and soon became effective soldiers. A leader was found for them after their own heart—the brave and patriotic Blucher, who had been reserving himself for this day, and Scharnhorst and Gneisenau, better tacticians than himself, were appointed to assist him, and carry out all the strategic movements; whilst Blucher, never depressed by difficulties, never daunted by defeat, led them on with the cheer from which he derived his most common appellation of Marshal Forwards—"Forwards! my children, forwards!" All classes hastened to contribute the utmost amount possible to the necessary funds for this sacred war. The ladies gave in their gold chains and bracelets, their diamonds and rubies, and wore as ornaments chains and bracelets of beautifully wrought iron.

Austria stood in a hesitating position. On the one hand, she felt reluctant to join the Allies and assist in destroying the throne of the Emperor's son-in-law; but at the same time she was anxious to strengthen her own position by giving more strength to her neighbour, Prussia. For this purpose Austria offered her mediation for a peace on terms that would restore Prussia to a more becoming position, and such proposals of mediation were made by the Austrian Minister to Great Britain. But these entirely failed. On the one hand, Napoleon would concede nothing, but declared that he would entirely annihilate Prussia, and would give Silesia to Austria for her assistance in the war; on the other hand, Great Britain declared that there could be no peace unless France disgorged the bulk of her usurpations.

On the 15th of April Buonaparte quitted Paris, for the last time as a permanent abode; on the 16th he was at Mainz, and on the 25th at Erfurt. Before quitting Paris he had appointed Maria Louisa regent in his absence. This he deemed a stroke of policy likely to conciliate the Emperor of Austria. But the Empress's power was merely nominal. She could appear at the Council board, but it was only as the instrument of the Emperor; he carried all active power along with him, and ruled France from his camp. He had still upwards of fifty thousand troops in the garrisons of Prussia, commanded by Eugene, the Viceroy of Italy; and he advanced at the head of three hundred thousand men. Eugene Beauharnais had been compelled necessarily to evacuate Dantzic, Berlin, and Dresden as the Russians and Prussians advanced, and to retreat upon the Elbe. In the month of May Bernadotte, according to concert, crossed over to Stralsund with thirty-five thousand men, and awaited the reinforcements of Russians and Germans which were to raise his division to eighty thousand men, with which he was to co-operate with the Allies, and protect Hamburg. The Allies, under Tetterborn, Czernicheff, and Winzengerode, spread along both sides of the Elbe, the Germans rising enthusiastically wherever they came. Hamburg, Lübeck, and other towns threw open their gates to them. The French general, Morand, endeavouring to quell the rising of the people of Lüneburg, was surprised by the Russians, and his detachment of four thousand men was cut to pieces, or taken prisoners. Eugene marched from Magdeburg to surprise Berlin, but was met at Möckern, defeated, and driven back to Magdeburg. Such was the success of the Allies, and the exulting support of the people, that even Denmark and Saxony began to contemplate going over to the Allies. Blucher entered Dresden on the 27th of March, driving Davoust before him, who blew up an arch of the fine bridge to cover his retreat. The Emperor of Russia and King of Prussia entered the city soon afterwards, and were received by the inhabitants with acclamations. On the 28th of April died the old Russian general, Kutusoff, at Bautzen, and was succeeded by General Wittgenstein.

At the approach of the new French levies, Eugene Beauharnais retreated from Magdeburg, and joined them on the Saale. The Allies and Napoleon now lay face to face, the Allies cutting off his advance towards Leipsic and thence to Dresden. He resolved to make a determined attack upon them, and demoralise them by a blow which should make him master of Leipsic, Dresden, and Berlin at once, and give its impression to the whole campaign. In the skirmishes which took place previous to the general engagement at Weissenfels and Poserna on the 29th of April and the 1st of May, Buonaparte gained some advantages; but in the latter action his old commander of the Imperial Guard, Marshal Bessières, was killed. His death was deeply lamented, both by his men, who had served under him from the very commencement of Buonaparte's career, and by Buonaparte himself.

The first great battle was destined to be fought on the very ground where Gustavus Adolphus fell, 1632. Buonaparte marched upon Leipsic, expecting to find the Allies posted there; but he was suddenly brought to a stand by them at Lützen. The Allies, who were on the left bank of the Elster, crossed to the right, and impetuously attacked the French, whose centre was at the village of Kaya, under the command of Ney, supported by the Imperial Guard, and their fine artillery drawn up in front of the town of Lützen; the right wing, commanded by Marmont, extending as far as the defile of Poserna, and the left stretching from Kaya to the Elster. Napoleon did not expect to have met the Allies on that side of Leipsic, and was pressing briskly forward when the attack commenced. Ney was first stopped at Gross-Görschen. Had Wittgenstein made a decided charge with his whole column, instead of attacking by small brigades, he would assuredly have broken the French lines. But Buonaparte rode up, and galloped from place to place to throw fresh troops on the point of attack, and to wheel up both of his wings so as to enclose, if possible, both flanks of the Allies. The conflict lasted some hours, during which it was uncertain whether the Allies would break the centre of the French, or the French would be able to outflank the Allies. Blucher was late on the field; the officer who was sent overnight to him with orders from Wittgenstein is said to have put them under his pillow and slept on them till roused by the cannon. At length, after a desperate attack by Napoleon to recover the village of Kaya, out of which he had been driven, the Allies observing that the firing of Macdonald and Bertrand, who commanded the two wings, was fast extending along their flanks, skilfully extricated themselves from the combat, and led back their columns so as to escape being outflanked by the French. Yet they did not even then give up the struggle for the day. The Allied cavalry made a general attack in the dark, but it failed from the mighty masses of the French on which they had to act. The Allies captured some cannon, the French none. The loss of the Allies was twenty thousand men, killed and wounded: that of the French was equally severe. Seven or eight French generals were killed or wounded. On the side of the Allies fell General Scharnhorst—an irreparable loss, for no man had done more to organise the Prussian landwehr and volunteers. The Prince Leopold of Hesse-Homburg and the Prince of Mecklenburg-Strelitz, both allied to the royal family of England, were slain, and Blucher himself was wounded; but he had his wounds dressed on the field, and would not quit it till the last moment.