Mexico was twice revolutionized. The first struggle began in 1809 and 1810, and was carried on spasmodically until 1817. The second revolution broke out in 1820 on receipt of the news from Spain of the revolution of March, 1820, and the re-adoption of the constitution of 1812. The old revolutionists demanded the proclamation of this constitution in Mexico, but the Viceroy Apodaca opposed them. Augustin de Iturbide, a native Mexican, who in the first revolution had steadfastly adhered to the cause of the king, now defected to the popular side with a large body of troops which the viceroy had entrusted to his command. On February 24, 1821, he issued the celebrated document known as the Plan of Iguala, from the town of that name. In it he proposed the maintenance of the Roman Catholic religion to the exclusion of all others, the independence of Mexico from Spain, and the establishment of a limited monarchy. The Imperial Crown of Mexico was to be offered first to Ferdinand VII; in the event of his declining, to the younger princes of his house; and in the event of their refusal, the duty of naming an emperor was to fall to the representative assembly of Mexico. The personal and property rights of Spaniards in Mexico were carefully guaranteed. In securing the interests of Spaniards and of the clergy, those who had most to lose, this plan differed essentially from the revolutionary policy of the other Spanish colonies. On the other hand, the Creole element was satisfied with the promise of independence and a representative government. The revolutionary army became known as "the Army of the Three Guarantees," these being (1) the maintenance of the religious establishment in its present form, (2) independence, and (3) the union of Americans and Spaniards.[35] This ingenious document received immediately the widest approval. The Viceroy Apodaca had practically abdicated when his successor, General O'Donaju, arrived from Spain. As the latter had come without troops, there was nothing left but for him to recognize the revolution as an accomplished fact and make the best terms for his country he could. Accordingly he met Iturbide in conference at Cordova, and after a brief discussion signed the treaty bearing that name, August 24, 1821. It was agreed that a provisional junta should be appointed, that O'Donaju should be a member, and that the junta should proceed to carry into effect the plan of Iguala. O'Donaju then persuaded the Royalists to open the gates of the capital, and on September 27, 1821, Iturbide entered. Shortly thereafter O'Donaju died from the yellow fever, thus leaving Iturbide free to carry out his plans. The Spanish government, of course, repudiated the treaty of Cordova.