The Peruvian viceroyalty was the centre of the Spanish power, the treasury and arsenal of the royalists. Bolivar, in Colombia, and San Martin, in Chili, understood that all their victories would remain futile if they did not defeat Spain in the richest and most impregnable of her domains. Lord Cochrane, an English privateer, who had seen service in the Mediterranean, formed a squadron in Chilian waters for the purpose of dominating the Pacific (1819). He defeated the Spanish fleet at Callao, and declared a blockade of the Peruvian ports as far as Guayaquil. During this time San Martin was making ready, with his Argentine and Chilian troops, for his expedition of liberation. The Peruvian revolutionaries were awaiting him. He landed at Pisco (1820) with his army, and proclaimed the independence of Peru at Lima, which the Spaniards had deserted, on the 21st of July, 1821. Appointed Protector of the Republic which he had founded, he promulgated a provisional Constitution. Then from the North came another Liberator, Bolivar, to discuss with San Martin, in that mysterious interview at Guayaquil, the destinies of the Spanish New World. [Illustration: SAN MARTIN. General of Argentine, Liberator of Chile, and Protector of Peru. To face p. 68.] San Martin, stoical and silent, yielded to the {69} impetuosity of Bolivar, abandoned Peru to him, the theatre of his future deeds of prowess, renounced his position (1822), and left America. His ambition, like his genius, was circumscribed; he preferred military glory to dictatorships; he believed in the benefits of foreign monarchies: he could organise armies, but he was powerless before anarchy.