At length, however, on the 24th of February, 1812, a treaty was dictated to Frederick, under condition of subscribing which, the name and title of King of Prussia were to be yet left him; failing his compliance, Davoust, who had occupied Swedish Pomerania, was to march into Prussia, and treat it as a hostile country. In thus sparing for the time a monarch, of whom he had every reason to be jealous, Napoleon seems to have considered it more advisable to use Frederick's assistance, than to throw him into the arms of Russia. The conditions of this lenity were severe; Prussia was to place at the disposal of France about 20,000 men, with sixty pieces of artillery, the disposable part of the poor remnant of the standing army of the great Frederick. She was also to supply the French army with every thing necessary for their sustenance as they passed through her dominions; but the expense of these supplies was to be imputed as part of the contributions imposed on Prussia by France, and not yet paid. Various other measures were taken to render it easy for the French, in case of necessity, to seize such fortresses belonging to Prussia as were not already in their hands, and to keep the Prussian people as much as possible disarmed, a rising amongst them being considered inevitable if the French arms should sustain any reverse. Thus, while Russia fortified herself with the assistance of France's old ally Sweden, France advanced against Russia, supported by the remaining army of Frederick of Prussia, who was at heart Alexander's best well-wisher. [Sidenote: RELATIONS WITH AUSTRIA.] Napoleon had, of course, a weighty voice in the councils of his father-in-law of Austria. But the Austrian cabinet were far from regarding his plans of ambitious aggrandisement with a partial eye. The acute Metternich had been able to discover and report to his master, on his return to Vienna in the spring of 1811, that the marriage which had just been celebrated, would not have the effect of inducing Napoleon to sheathe his sword, or of giving to Europe permanent tranquillity. And now, although on the approach of the hostilities into which they were to be involved by their formidable ally, Austria agreed to supply an auxiliary army of 30,000 men, under Prince Schwartzenberg, it seems probable that she remembered, at the same time, the moderate and lenient mode of carrying on the war practised by Russia, when the ally of Napoleon during the campaign of Wagram, and gave her general secret instructions to be no further active in the campaign than the decent supporting of the part of an auxiliary peremptorily required.