Even before the allied armies entered Paris Wellington considered it necessary to induce Louis XVIII. to make advances to certain politicians of the revolution so as to inspire national confidence in him, and to anticipate the risk of a "White Terror," or a continuance of the war. Fouché was accordingly summoned to power, and he had sufficient influence to prevent any national opposition to the Bourbon restoration. Napoleon remained at large for three weeks after his abdication, that is, for eight days after the allied troops had entered Paris, and the fear of a future Bonapartist revolution inclined the British government under Liverpool to entertain favourably the demand of Prussia for the cession of Alsace, Lorraine, and the northern fortresses. When, however, Napoleon had placed himself on board the _Bellerophon_, the situation changed. A contented France seemed preferable to an impotent France, and Wellington argued that the Bourbon restoration could not last, if French opinion connected it with the loss of Alsace and Lorraine. The tsar took this line from the first, and Wellington won for it the adhesion first of his own government and then of Austria. Prussia had finally to be contented with a provision for the cession of the outlying districts, which the treaty of Paris of 1814 had left to France. The second treaty of Paris, which embodied this stipulation, also provided for an indemnity of £40,000,000 to be paid by France to the allies, and for the temporary occupation of Northern France by the allied armies. On the same day Austria, Great Britain, Prussia, and Russia signed a treaty pledging themselves to act together in case fresh revolution and usurpation in France should endanger the repose of other states, and providing for frequent meetings of congresses to preserve the peace of Europe.