Civil war broke out in Spain. Across the border in Portugal, Dom Miguel, the second son of the absent king, excited a counter revolution. This state of affairs in the Peninsula gave a finishing stroke to the royal cause in America. In Central America, the revolutionists of Costa Rica and Guatemala, who had made common cause with Mexico, proclaimed their independence. In Mexico, Santa Anna proclaimed the republic at Vera Cruz. Emperor Iturbide, who felt his throne tottering beneath him, retired, and was banished from Mexico with an annuity. His sympathizers in Costa Rica were overthrown in a battle at Ochomoco. On the first day of July, Costa Rica was united with its neighboring States in the federation of Central America. Nor had Peru been idle. Two royalist armies under Santa Cruz had entered the upper provinces. During the summer months they overran the country between La Paz and Oruro. But in early autumn they were forced back by the revolutionists under Bolivar, who entered Lima on September 1, and had himself proclaimed dictator of Peru. In Brazil, during this interval, the Constitutional Assembly had been convoked in accordance with Dom Pedro's promise. Under the leadership of the two Andrade brothers the delegates insisted on the most liberal of constitutions. Dom Pedro's first attempt to suppress the liberal leaders was foiled by the Assembly. Finally he dissolved the contentious assembly and exiled the Andrade brothers to France. In the provinces of Pernambuco and Ceara a republic was proclaimed. Rebellion broke out in Cisplatina. [Sidenote: Warring factions in Spain] [Sidenote: Siege of Cadiz] In Spain, the two opposing regencies vied with each other in retaliatory measures. Odious persecutions were instituted on both sides. In vain the Duke of Angouleme tried to restrain the reprisals of the Spanish royalists. In August he appeared before Cadiz. He called upon King Ferdinand to publish an amnesty and restore the medieval Cortes. But the Spanish Ministry, in the King's name, sent a defiant answer. Cadiz was thereupon besieged. On August 30, the French stormed the fort of the Trocadero. Three weeks later the city was bombarded. For the Spanish liberals, the cause had become hopeless. The French refused all terms but the absolute liberation of the King. On Ferdinand's assurance that he bore no grudge against his captors, the liberals agreed to release him. At last, on the 30th of September, Ferdinand signed a proclamation of absolute and universal amnesty. Next day he was taken across the bay to the French headquarters. The Cortes dissolved. [Sidenote: Release of Ferdinand VII.]