Almost at the same time that Bonaparte ascended the throne, Pitt returned to power in Great Britain. He was summoned by the general distrust felt in Addington's Ministry, and by the belief that no statesman but himself could rally the Powers of Europe against the common enemy. Pitt was not long in framing with Russia the plan of a third Coalition. The Czar broke off diplomatic intercourse with Napoleon in September, 1804, and induced the Court of Vienna to pledge itself to resist any further extension of French power. Sweden entered into engagements with Great Britain. On the opening of Parliament at the beginning of 1805, King George III. announced that an understanding existed between Great Britain and Russia, and asked in general terms for a provision for Continental subsidies. In April, a treaty was signed at St. Petersburg by the representatives of Russia and Great Britain, far more comprehensive and more serious in its provisions than any which had yet united the Powers against France. [107] Russia and England bound themselves to direct their efforts to the formation of a European League capable of placing five hundred thousand men in the field. Great Britain undertook to furnish subsidies to every member of the League; no peace was to be concluded with France but by common consent; conquests made by any of the belligerents were to remain unappropriated until the general peace; and at the termination of the war a Congress was to fix certain disputed points of international right, and to establish a federative European system for their maintenance and enforcement. As the immediate objects of the League, the treaty specified the expulsion of the French from Holland, Switzerland, Italy, and Northern Germany; the re-establishment of the King of Sardinia in Piedmont, with an increase of territory; and the creation of a solid barrier against any future usurpations of France. The last expression signified the union of Holland and part of Belgium under the House of Orange. In this respect, as in the provision for a common disposal of conquests and for the settlement of European affairs by a Congress, the Anglo-Russian Treaty of 1805 defined the policy actually carried out in 1814. Other territorial changes now suggested by Pitt, including the annexation of the Rhenish Provinces to the Prussian Monarchy, were not embodied in the treaty, but became from this time understood possibilities. [Policy of Prussia.] [Prussia neutral.]