One good test for determining the importance of Waterloo, is to ascertain what was felt by wise and prudent statesmen before that battle, respecting the return of Napoleon from Elba to the Imperial throne of France, and the probable effects of his success. For this purpose, I will quote the words, not of any of our vehement anti-Gallican politicians of the school of Pitt, but of a leader of our Liberal party, of a man whose reputation as a jurist, a historian and a far-sighted and candid statesman, was, and is, deservedly high, not only in this country, but throughout Europe. Sir James Mackintosh, in the debate in the British House of Commons, on the 20th April, 1815, spoke thus of the return from Elba:—

"Was it in the power of language to describe the evil. Wars which had raged for more than twenty years throughout Europe; which had spread blood and desolation from Cadiz to Moscow, and from Naples to Copenhagen; which had wasted the means of human enjoyment, and destroyed the instruments of social improvement; which threatened to diffuse among the European nations, the dissolute and ferocious habits of a predatory soldiery,—at length, by one of those vicissitudes which bid defiance to the foresight of man, had been brought to a close, upon the whole, happy beyond all reasonable expectation, with no violent shock to national independence, with some tolerable compromise between the opinions of the age and reverence due to ancient institutions; with no too signal or mortifying triumph over the legitimate interests or avowable feelings of any numerous body of men, and, above all, without those retaliations against nations or parties, which beget new convulsions, often as horrible as those which they close, and perpetuate revenge and hatred and bloodshed, from age to age. Europe seemed to breathe after her sufferings. In the midst of this fair prospect, and of these consolatory hopes, Napoleon Bonaparte escaped from Elba; three small vessels reached the coast of Provence; our hopes are instantly dispelled; the work of our toil and fortitude is undone; the blood of Europe is spilt in vain—

"'Ibi omnis effusus labor!'"

The Congress of Emperors, Kings, Princes, Generals, and Statesmen, who had assembled at Vienna to remodel the world after the overthrow of the mighty conqueror, and who thought that Napoleon had passed away for ever from the great drama of European politics, had not yet completed their triumphant festivities, and their diplomatic toils, when Talleyrand, on the 11th of March, 1815, rose up among them, and announced that the ex-emperor had escaped from Elba, and was Emperor of France once more. It is recorded by Sir Walter Scott, as a curious physiological fact, that the first effect of the news of an event which threatened to neutralise all their labours, was to excite a loud burst of laughter from nearly every member of the Congress. [Life of Napoleon, vol. viii. chap. 1.] But the jest was a bitter one: and they soon were deeply busied in anxious deliberations respecting the mode in which they should encounter their arch-enemy, who had thus started from torpor and obscurity into renovated splendour and strength:

"Qualis ubi in lucem coluber mala gramina pastus,
Frigida sub terra tumidum quem bruma tegebat,
Nunc positis novus exuviis nitidusque juventa,
Lubrica convolvit sublato pectore terga
Arduus ad solem, at linguis micat ore trisulcis." Virg. AEN.

Napoleon sought to disunite the formidable confederacy, which he knew would be arrayed against him, by endeavouring to negotiate separately with each of the allied sovereigns. It is said that Austria and Russia were at first not unwilling to treat with him. Disputes and jealousies had been rife among several of the Allies on the subject of the division of the conquered countries; and the cordial unanimity with which they had acted during 1813 and the first months of 1814, had grown chill during some weeks of discussions. But the active exertions of Tralleyrand, who represented Louis XVIII. at the Congress, and who both hated and feared Napoleon with all the intensity of which his powerful spirit was capable, prevented the secession of any member of the Congress from the new great league against their ancient enemy. Still it is highly probable that, if Napoleon had triumphed in Belgium over the Prussians and the English, he would have succeeded in opening negotiations with the Austrians and Russians; and he might have thus gained advantages similar to those which he had obtained on his return from Egypt, when he induced the Czar Paul to withdraw the Russian armies from co-operating with the other enemies of France in the extremity of peril to which she seemed reduced in 1799. But fortune now had deserted him both in diplomacy and in war.

On the 13th of March, 1815, the Ministers of the seven powers, Austria, Spain, England, Portugal, Prussia, Russia, and Sweden, signed a manifesto, by which they declared Napoleon an outlaw; and this denunciation was instantly followed up by a treaty between England, Austria, Prussia, and Russia (to which other powers soon acceded), by which the rulers of those countries bound themselves to enforce that decree, and to prosecute the war until Napoleon should be driven from the throne of France, and rendered incapable of disturbing the peace of Europe. The Duke of Wellington was the representative of England at the Congress of Vienna, and he was immediately applied to for his advice on the plan of military operations against France. It was obvious that Belgium would be the first battle-field; and by the general wish of the Allies, the English Duke proceeded thither to assemble an army from the contingents of Dutch, Belgian, and Hanoverian troops, that were most speedily available, and from the English regiments which his own Government was hastening to send over from this country. A strong Prussian corps was near Aix-la-Chapelle, having remained there since the campaign of the preceding year. This was largely reinforced by other troops of the same nation; and Marshal Blucher, the favourite hero of the Prussian soldiery, and the deadliest foe of France, assumed the command of this army, which was termed the Army of the Lower Rhine; and which, in conjunction with Wellington's forces, was to make the van of the armaments of the Allied Powers. Meanwhile Prince Swartzenburg was to collect 130,000 Austrians, and 124,000 troops of other Germanic States, as "the Army of the Upper Rhine;" and 168,000 Russians, under the command of Barclay de Tolly, were to form "the Army of the Middle Rhine," and to repeat the march from Muscovy to that river's banks.

The exertions which the Allied Powers thus made at this crisis to grapple promptly with the French emperor have truly been termed gigantic; and never were Napoleon's genius and activity more signally displayed, than in the celerity and skill by which he brought forward all the military resources of France, which the reverses of the three preceding years, and the pacific policy of the Bourbons during the months of their first restoration, had greatly diminished and disorganized. He re-entered Paris on the 20th of March, and by the end of May, besides sending a force into La Vendee to put down the armed rising of the royalists in that province, and besides providing troops under Massena and Suchet for the defence of the southern frontiers of France, Napoleon had an army assembled in the north-east for active operations under his own command, which amounted to between one hundred and twenty, and one hundred and thirty thousand men, with a superb park of artillery and in the highest possible state of equipment, discipline, and efficiency. [See for these numbers Siborne's History of the Campaign of Waterloo, vol. i. p. 41.]

The approach of the multitudinous Russian, Austrian, Bavarian, and other foes of the French Emperor to the Rhine was necessarily slow; but the two most active of the allied powers had occupied Belgium with their troops, while Napoleon was organizing his forces. Marshal Blucher was there with one hundred and sixteen thousand Prussians; and, before the end of May, the Duke of Wellington was there also with about one hundred and six thousand troops, either British or in British pay. [Ibid. vol. i. chap. 3. Wellington had but a small part of his old Peninsular army in Belgium. The flower of it had been sent on the expeditions against America. His troops, in 1815, were chiefly second battalions, or regiments lately filled up with new recruits. See Scott, vol viii. p. 474.] Napoleon determined to attack these enemies in Belgium. The disparity of numbers was indeed great, but delay was sure to increase the proportionate numerical superiority of his enemies over his own ranks. The French Emperor considered also that "the enemy's troops were now cantoned under the command of two generals, and composed of nations differing both in interest and in feelings." [See Montholon's Memoirs, p. 45.] His own army was under his own sole command. It was composed exclusively of French soldiers, mostly of veterans, well acquainted with their officers and with each other, and full of enthusiastic confidence in their commander. If he could separate the Prussians from the British, so as to attack each singly, he felt sanguine of success, not only against these the most resolute of his many adversaries, but also against the other masses, that were slowly labouring up against his eastern dominions.

The triple chain of strong fortresses, which the French possessed on the Belgian frontier, formed a curtain, behind which Napoleon was able to concentrate his army, and to conceal, till the very last moment, the precise line of attack which he intended to take. On the other hand, Blucher and Wellington were obliged to canton their troops along a line of open country of considerable length, so as to watch for the outbreak of Napoleon from whichever point of his chain of strongholds he should please to make it. Blucher, with his army, occupied the banks of the Sambre and the Meuse, from Liege on his left, to Charleroi on his right; and the Duke of Wellington covered Brussels; his cantonments being partly in front of that city and between it and the French frontier, and partly on its west their extreme right reaching to Courtray and Tournay, while the left approached Charleroi and communicated with the Prussian right. It was upon Charleroi that Napoleon resolved to level his attack, in hopes of severing the two allied armies from each other, and then pursuing his favourite tactic of assailing each separately with a superior force on the battle-field, though the aggregate of their numbers considerably exceeded his own.