The master-stroke in the policy of Cavour as a statesman was to make a firm alliance with France and England, to be used as a lever against Austria. He saw the improbability of securing liberty to Italy unless the Austrians were expelled by force of arms. The Sardinian kingdom, with only five millions of people, was inadequate to cope singly with one of the most powerful military monarchies of Europe. Cavour looked for deliverance only by the aid of friendly Powers, and he secured the friendship of both France and England by offering five thousand troops for the Crimean war. On the 10th of January, 1855, a treaty was signed which admitted Sardinia on equal terms as the ally of the Western Powers; and the Sardinian army, under the command of General La Marmora, rendered very substantial aid, and fought with great gallantry in the Crimea. When, in 1856, an armistice took place between the contending Powers, followed by the Congress of Paris, Cavour took his place with the envoys of the great Powers. Furthermore, he availed himself of his opportunities to have private conferences with the Emperor Napoleon III. in reference to Italian matters; and his influence with the foreign statesmen he met in Paris was equally beneficial to the great end to which his life was devoted. His diplomacy was unrivalled for tact, and the ministers of France and England saw and acknowledged it. By his diplomatic abilities he enlisted the Emperor of the French in behalf of Italian independence, and, perhaps more than any other man, induced him to make war on Austria. Cavour's lucid exposition of the internal affairs of Italy brought out the condemnation of the Russian and Prussian envoys as well as that of the English ministry, and led to their expostulation with the Austrian government. But all in vain. Austria would listen to no advice, and blindly pursued her oppressive policy, to the exasperation of the different leaders whatever may have been their peculiar views of government. All this prepared the way for the acknowledgment of Sardinia as the leader in the matter of Italian emancipation, whom the other Italian States were willing to follow. The hopes of the Italians were now turned to the House of Savoy, to its patriotic chief, and to its able minister, whose counsels Victor Emmanuel in most cases followed. From this time the republican societies which Mazzini had established lost ground before the ascendency which Cavour had acquired in Italian politics. Of the Western Powers, he would have preferred an alliance with Great Britain; but when he found he could expect from the English government no assistance by arms against Austria, he drew closer to the French emperor as the one power alone from whom efficient aid was to be obtained, and set his sharp wits at work to make such a course both easy and profitable to France.