The disputes in the congress raised Napoleon's hopes. In France, his party was still powerful, almost the whole of the population being blindly devoted to him, and an extensive conspiracy for his restoration to the imperial throne was secretly set on foot. Several thousands of his veteran soldiery had been released from foreign durance; the whole of the military stores, the spoil of Europe, still remained in the possession of France; the fortresses were solely garrisoned with French troops; Elba was close at hand, and the emperor was guarded with criminal negligence. Heavy, indeed, is the responsibility of those who, by thus neglecting their charge, once more let loose this scourge upon the earth![8] Napoleon quitted his island, and, on the 1st of March, 1815, again set foot on the coast of France. He was merely accompanied by one thousand five hundred men, but the whole of the troops sent against him by Louis XVIII. ranged themselves beneath his eagle. He passed, as if in triumph, through his former empire. The whole nation received him with acclamations of delight. Not a single Frenchman shed a drop of blood for the Bourbon, who fled hastily to Ghent; and, on the 20th of March, Napoleon entered Paris unopposed. His brother-in-law, Murat, at the same time revolted at Naples and advanced into Upper Italy against the Austrians. But all the rest of Napoleon's ancient allies, persuaded that he must again fall, either remained tranquil or formed a close alliance with the combined powers. The Swiss, in particular, showed excessive zeal on this occasion, and took up arms against France, in the hope of rendering the allied sovereigns favorable to their new constitution, The Swiss regiments, which had passed from Napoleon's service to that of Louis XVIII., also remained unmoved by Napoleon's blandishments, were deprived of their arms and returned separately to Switzerland.

The allied sovereigns were still assembled at Vienna, and at once allowed every dispute to drop in order to form a fresh and closer coalition. They declared Napoleon an outlaw, a robber, proscribed by all Europe, and bound themselves to bring a force more than a million strong into the field against him. All Napoleon's cunning attempts to bribe and set them at variance were treated with scorn, and the combined powers speedily came to an understanding on the points hitherto so strongly contested. Saxony was partitioned between her ancient sovereign and Prussia, and a revolt that broke out in Liege among the Saxon troops, who were by command of Prussia to be divided before they had been released from their oath of allegiance to their king, is easily explained by the hurry and pressure of the times, which caused all minor considerations to be forgotten.[9] Napoleon exclusively occupied the mind of every diplomatist, and all agreed in the necessity, at all hazards, of his utter annihilation. The lion, thus driven at bay, turned upon his pursuers for a last and desperate struggle. The French were still faithful to Napoleon, who, with a view of reinspiring them with the enthusiastic spirit that had rendered them invincible in the first days of the republic, again called forth the old republicans, nominated them to the highest appointments, re-established several republican institutions, and, on the 1st of June, presented to his dazzled subjects the magnificent spectacle of a field of May, as in the times of Charlemagne and in the commencement of the Revolution, and then led a numerous and spirited army to the Dutch frontiers against the enemy.

Here stood a Prussian army under Blucher, and an Anglo-German one under Wellington, comprehending the Dutch under the Prince of Orange, the Brunswickers under their duke, the recruited Hanoverian Legion under Wallmoden. These corps d'armée most imminently threatened Paris. The main body of the allied army, under Schwarzenberg, then advancing from the south, was still distant. Napoleon consequently directed his first attack against the two former. His army had gained immensely in strength and spirit by the return of his veteran troops from foreign imprisonment. Wellington, ignorant at what point Napoleon might cross the frontier, had followed the old and ill-judged plan of dividing his forces; an incredible error, the allies having simply to unite their forces and to take up a firm position in order to draw Napoleon to any given spot. Wellington, moreover, never imagined that Napoleon was so near at hand, and was amusing himself at a ball at Brussels, when Blucher, who was stationed in and around Namur, was attacked on the 14th of June, 1815.[10] Napoleon afterward observed in his memoirs that he had attacked Blucher first because he well knew that Blucher would not be supported by the over-prudent and egotistical English commander, but that Wellington, had he been first attacked, would have received every aid from his high-spirited and faithful ally. Wellington, after being repeatedly urged by Blucher, collected his scattered corps, but neither completely nor with sufficient rapidity; and on Blucher's announcement of Napoleon's arrival, exerted himself on the following morning so far as to make a reconnaissance. The duke of Brunswick, with impatience equalling that of Blucher, was the only one who had quitted the ball during the night and had hurried forward against the enemy. Napoleon, owing to Wellington's negligence, gained time to throw himself between him and Blucher and to prevent their junction; for he knew the spirit of his opponents. He consequently opposed merely a small division of his army under Ney to the English and turned with the whole of his main body against the Prussians. The veteran Blucher perceived his intentions[11] and in consequence urgently demanded aid from the Duke of Wellington, who promised to send him a reinforcement of twenty thousand men by four o'clock on the 16th. But this aid never arrived, Wellington, although Ney was too weak to obstruct the movement, making no attempt to perform his promise. Wellington retired with superior forces before Ney at Quatre Bras, and allowed the gallant and unfortunate Duke William of Brunswick to fall a futile sacrifice. Blucher meanwhile yielded to the overwhelming force brought against him by Napoleon at Ligny, also on the 16th of June. Vainly did the Prussians rush to the attack beneath the murderous fire of the French, vainly did Blucher in person head the assault and for five hours continue the combat hand to hand in the village of Ligny. Numbers prevailed, and Wellington sent no relief. The infantry being at length driven back, Blucher led the cavalry once more to the charge, but was repulsed and fell senseless beneath his horse, which was shot dead. His adjutant, Count Nostitz, alone remained at his side. The French cavalry passed close by without perceiving them, twilight and a misty rain having begun to fall. The Prussians fortunately missed their leader, repulsed the French cavalry, which again galloped past him as he lay on the ground, and he was at length drawn from beneath his horse. He still lived, but only to behold the complete defeat of his army.

Blucher, although a veteran of seventy-three, and wounded and shattered by his fall, was not for a moment discouraged.[12] Ever vigilant, he assembled his scattered troops with wonderful rapidity, inspirited them by his cheerful words, and had the generosity to promise aid, by the afternoon of the 18th of June, to Wellington, who was now in his turn attacked by the main body of the French under Napoleon. What Wellington on the 16th, with a fresh army, could not perform, Blucher now effected with troops dejected by defeat, and put the English leader to the deepest shame by—keeping his word.[13] He consequently fell back upon Wavre in order to remain as close as possible in Wellington's vicinity, and also sent orders to Bulow's corps, that was then on the advance, to join the English army, while Napoleon, in the idea that Blucher was falling back upon the Meuse, sent Grouchy in pursuit with a body of thirty-five thousand men.[14]

Napoleon, far from imagining that the Prussians, after having been, as he supposed, completely annihilated or panic-stricken by Grouchy, could aid the British, wasted the precious moments, and, instead of hastily attacking Wellington, spent the whole of the morning of the 18th in uselessly parading his troops, possibly with a view of intimidating his opponents and of inducing them to retreat without hazarding an engagement. His well-dressed lines glittered in the sunbeams; the infantry raised their tschakos on their bayonet points, the cavalry their helmets on their sabres, and gave a general cheer for their emperor. The English, however, preserved an undaunted aspect. At length, about midday, Napoleon gave orders for the attack, and, furiously charging the British left wing, drove it from the village of Hougumont. He then sent orders to Ney to charge the British centre. At that moment a dark spot was seen in the direction of St. Lambert. Was it Grouchy? A reconnoitring party was despatched and returned with the news of its being the Prussians under Bulow. The attack upon the British centre was consequently remanded, and Ney was despatched with a considerable portion of his troops against Bulow. Wellington now ventured to charge the enemy with his right wing, but was repulsed and lost the farm of La Haye Sainte, which commanded his position on this side as Hougumont did on his right. His centre, however, remained unattacked, the French exerting their utmost strength to keep Bulow's gallant troops back at the village of Planchenoit, where the battle raged with the greatest fury, and a dreadful conflict of some hours' duration ensued hand to hand. But about five o'clock, the left wing of the British being completely thrown into confusion by a fresh attack on the enemy's side, the whole of the French cavalry, twelve thousand strong, made a furious charge upon the British centre, bore down all before them, and took a great number of guns. The Prince of Orange was wounded. The road to Brussels was already thronged with the fugitive English troops, and Wellington, scarcely able to keep his weakened lines together,[15] was apparently on the brink of destruction, when the thunder of artillery was suddenly heard in the direction of Wavre. "It is Grouchy!" joyfully exclaimed Napoleon, who had repeatedly sent orders to that general to push forward with all possible speed. But it was not Grouchy, it was Blucher.

The faithful troops of the veteran marshal (the old Silesian army) were completely worn out by the battle, by their retreat in the heavy rain over deep roads, and by the want of food. The distance from Wavre, whence they had been driven, to Waterloo, where Wellington was then in action, was not great, but was rendered arduous owing to these circumstances. The men sometimes fell down from extreme weariness, and the guns stuck fast in the deep mud. But Blucher was everywhere present, and notwithstanding his bodily pain ever cheered his men forward, with "indescribable pathos," saying to his disheartened soldiers, "My children, we must advance; I have promised it, do not cause me to break my word!" While still distant from the scene of action, he ordered the guns to be fired in order to keep up the courage of the English, and at length, between six and seven in the evening, the first Prussian corps in advance, that of Ziethen, fell furiously upon the enemy: "Bravo!" cried Blucher, "I know you, my Silesians; to-day we shall see the backs of these French rascals!" Ziethen filled up the space still intervening between Wellington and Bulow. Exactly at that moment, Napoleon had sent his old guard forward in four massive squares in order to make a last attempt to break the British lines, when Ziethen fell upon their flank and dealt fearful havoc among their close masses with his artillery. Bulow's troops, inspirited by this success, now pressed gallantly forward and finally regained the long-contested village of Planchenoit from the enemy. The whole of the Prussian army, advancing at the double and with drums beating, had already driven back the right wing of the French, when the English, regaining courage, advanced, Napoleon was surrounded on two sides, and the whole of his troops, the old guard under General Cambronne alone excepted, were totally dispersed and fled in complete disorder. The old guard, surrounded by Bulow's cavalry, nobly replied, when challenged to surrender, "La garde ne se rend pas"; and in a few minutes the veteran conquerors of Europe fell beneath the righteous and avenging blows of their antagonists. At the farm of La Belle Alliance, Blucher offered his hand to Wellington. "I will sleep to-night in Bonaparte's last night's quarters," said Wellington. "And I will drive him out of his present ones!" replied Blucher. The Prussians, fired by enthusiasm, forgot the fatigue they had for four days endured, and, favored by a moonlight night, so zealously pursued the French that an immense number of prisoners and a vast amount of booty fell into their hands and Napoleon narrowly escaped being taken prisoner. At Genappe, where the bridge was blocked by fugitives, the pursuit was so close that he was compelled to abandon his carriage leaving his sword and hat behind him. Blucher, who reached the spot a moment afterward, took possession of the booty, sent Napoleon's hat, sword, and star to the king of Prussia, retained his cloak, telescope, and carriage for his own use, and gave up everything else, including a quantity of the most valuable jewelry, gold, and money, to his brave soldiery. The whole of the army stores, two hundred and forty guns, and an innumerable quantity of arms thrown away by the fugitives, fell into his hands.

The Prussian general, Thielemann, who, with a few troops, had remained behind at Wavre in order, at great hazard, to deceive Grouchy into the belief that he was still opposed by Blucher's entire force, acted a lesser, but equally honorable part on this great day. He fulfilled his commission with great skill, and so completely deceived Grouchy as to hinder his making a single attempt to throw himself in the way of the Prussians on the Paris road.

Blucher pushed forward without a moment's delay, and, on the 29th of June, stood before Paris. Napoleon had, meanwhile, a second time abdicated, and had fled from Paris in the hope of escaping across the seas. Davoust, the ancient instrument of his tyranny, who commanded in Paris, attempting to make terms of capitulation with Blucher, was sharply answered, "You want to make a defence? Take care what you do. You well know what license the irritated soldiery will take if your city must be taken by storm. Do you wish to add the sack of Paris to that of Hamburg, already loading your conscience?"[16] Paris surrendered after a severe engagement at Issy, and Muffling, the Prussian general, was placed in command of the city, July the 7th, 1815. It was on the occasion of a grand banquet given by Wellington shortly after the occupation of Paris by the allied troops that Blucher gave the celebrated toast, "May the pens of diplomatists not again spoil all that the swords of our gallant armies have so nobly won!"

Schwarzenberg had in the interim also penetrated into France, and the crown prince of Wurtemberg had defeated General Rapp at Strasburg and had surrounded that fortress. The Swiss, under General Bachmann, who had, although fully equipped for the field, hitherto prudently watched the turn of events, invaded France immediately after the battle of Waterloo, pillaged Burgundy, besieged and took the fortress of Huningen, which, with the permission of the allies, they justly razed to the ground, the insolent French having thence fired upon the bridges of Basel which lay close in its vicinity. A fresh Austrian army under Frimont advanced from Italy as far as Lyons. On the 17th of July, Napoleon surrendered himself in the bay of Rochefort to the English, whose ships prevented his escape; he moreover preferred falling into their hands than into those of the Prussians. The whole of France submitted to the triumphant allies, and Louis XVIII. was reinstated on his throne. Murat had also been simultaneously defeated at Tolentino in Italy by the Austrians under Bianchi, and Ferdinand IV. had been restored to the throne of Naples. Murat fled to Corsica, but his retreat to France was prevented by the success of the allies, and in his despair he, with native rashness, yielded to the advice of secret intriguants and returned to Italy with a design of raising a popular insurrection, but was seized on landing and shot on the 13th of October.[17]

Blucher was greatly inclined to give full vent to his justly roused rage against Paris. The bridge of Jena, one of the numerous bridges across the Seine, the principal object of his displeasure, was, curiously enough, saved from destruction (he had already attempted to blow it up) by the arrival of the king of Prussia.[18] His proposal to punish France by partitioning the country and thus placing it on a par with Germany, was far more practical in its tendency.