Austria was more fortunate, because an Austrian war would have been a serious diversion, not a step towards the invasion of Russia. She was in consequence able to impose her own terms on France. These terms, so far as the nature and extent of the Austrian assistance to France were concerned, had been sketched by Metternich to the British agent, Nugent, as far back as November, 1811, and they were accepted by France in a treaty of March 16, 1812.[54] Austria was to provide an army of 30,000 men to guard Napoleon's flank in Volhynia. In return France guaranteed the integrity of Turkey, and secretly promised a restoration of the Illyrian provinces to Austria in exchange for Galicia, which was to form a part of a reconstituted Poland. Elsewhere Napoleon's negotiations were unsuccessful. In January he fulfilled his threat of occupying Swedish Pomerania, but it had no effect on Swedish policy, and when in March he offered Finland and a part of Norway as the price of an alliance, his terms were rejected and Sweden allied herself with Russia. On April 17 Napoleon made overtures for peace with Great Britain, offering to evacuate Spain and to recognise the house of Braganza in Portugal and the Bourbons in Sicily, if the British would recognise the "actual dynasty" in Spain and Murat in Naples. The offer was certainly illusory. "Actual dynasty" was an ambiguous phrase, but would naturally mean the Bonapartes. Castlereagh declined to recognise Joseph, but declared his readiness to discuss the proposed basis if "actual dynasty" meant a recognition of Ferdinand VII. in Spain. Napoleon was enabled to say that his offers of peace had been rejected, and made no answer to Castlereagh.