The treaty of Tilsit was concluded on the 7th of July, 1807, and was signed on the 8th. The King and Queen of Prussia departed immediately, full of bitter sorrow and discouragement. The two emperors separated on the 9th, with a cordiality at that time sincere in its ostentatious display. More than once they had together passed their troops in review; yet once again they showed themselves to the two armies. Napoleon decorated, with his own hand, a soldier of the Russian army, who had been pointed out to him by the Czar. At last he accompanied Alexander to the shores of the Niemen, waiting upon the bank until his friend and ally had reached the farther shore. Then entering his carriage, he took the road to Königsberg, and immediately afterwards that to France, charging Berthier and Marshal Kalbreuth with the regulation of the details of the evacuation of Prussia, and the payment of the war contributions with which the conquered countries were to be crushed down. On the 27th of July, at six o'clock in the morning, the emperor re-entered Paris, which he had quitted the preceding year, and which, since then, he had so many times intoxicated with the report of his victories. The military glory was brilliant and even dazzling; the political work remained precarious, by its nature as well as by its immensity. Empires founded upon conquest are necessarily fragile, even when the war has been undertaken from serious and legitimate motives. When the war is carried on through the ambition of a man or a people, in scorn of right or justice--when it injures at once the interests, the pride, and the repose of all nations--no genius or brightness of glory can succeed in assuring its duration, or legitimatizing its success. France perceived this in the midst of the enthusiasm of victory. England repeated it with malicious confidence, in the hope of confirming the courage of its people. Once more the latter power found itself alone, in face of the ever-increasing might of France and the incomparable genius of its sovereign.