We ought not to omit to mention that Fouché, among others, took up a testimony against the Russian war. He had been permitted to return to his chateau of Ferrières, near Paris, under the apology that the air of Italy did not agree with his constitution. But Napoleon distrusted him, and the police were commissioned to watch with the utmost accuracy the proceedings of their late master. Fouché was well aware of this; and, desirous that his remonstrance with the Emperor should have all the force of an unexpected argument, he shut himself up in the strictest seclusion while engaged in composing a production, which perhaps he hoped might be a means of recalling him to recollection, if not to favour.[89] In an able and eloquent memorial, Fouché reminded Buonaparte, that he was already the absolute master of the finest empire the world had ever seen; and that all the lessons of history went to demonstrate the impossibility of attaining universal monarchy. The French empire had arrived, according to the reasoning of this able statesman, at that point when its ruler should rather think of securing and consolidating his present acquisitions, than of achieving farther conquests, since, whatever his empire might acquire in extent, it was sure to lose in solidity. Fouché stated the extent of the country which Napoleon was about to invade, the poverty of the soil, the rigour of the climate, and the distance which each fresh victory must remove him from his resources, annoyed as his communications were sure to be by nations of Cossacks and Tartars. He implored the Emperor to remember the fate of Charles XII. of Sweden. "If that warlike monarch," he said, "had not, like Napoleon, half Europe in arms at his back, neither had his opponent, the Czar Peter, four hundred thousand soldiers, and fifty thousand Cossacks. The invader, it was stated, would have against him the dislike of the higher ranks, the fanaticism of the peasantry, the exertions of soldiers accustomed to the severity of the climate. There were, besides, to be dreaded, in case of the slightest reverse, the intrigues of the English, the fickleness of his continental allies, and even the awakening of discontent and conspiracy in France itself, should an idea generally arise, that he was sacrificing the welfare of the state to the insatiable desire of fresh enterprises and distant conquests."