All his supporters moved with him. This massive departure is known as the Oriental exodus. The Supreme Director Gervasio Antonio de Posadas offered a reward of $6.000 for the capture of Artigas, dead or alive. The only consequence of this action was increased resentment of the orientals towards Buenos Aires. Several royalist leaders, such as Vigodet or Pezuela, sought an alliance with Artigas against Buenos Aires, but he rejected them: "I may not be sold, nor do I want more reward for my efforts than to see my nation free from the Spanish rule". Despite the deep disputes, Artigas was still eager to return to good terms with Buenos Aires, but only if the city accepted a national organization based on federalist principles. Posadas sent two more armies to capture and execute Artigas, but they mutinied and joined the orientals. When the Artiguist influence expanded to Corrientes, Posadas sought to negotiate by accepting the autonomy of the provinces. Artigas accepted the terms, but clarified that such autonomy must not be understood as national independence. He did not want to secede the Banda Oriental from the United provinces, but to organize them as a confederation. Posadas, who supported the authority of Buenos Aires as the head of a centralized state, delayed the approval of the treaty. Buenos Aires renewed the military actions against Montevideo. This time, the naval skills of Argentinian William Brown helped to overcome the strength of the Montevidean navy, leading to the final defeat of the royalist stronghold. Carlos María de Alvear led the capture of Montevideo, and lured Artigas there by promising that he would turn over the city to the Oriental patriots. Alvear attacked them without warning at Las Piedras, but Artigas managed to escape from the trap. Liga Federal In 1814, Artigas organized the Liga de los Pueblos Libres (League of the Free Peoples), of which he was declared Protector. In the following year, he liberated Montevideo from the control of the "Unitarians" from Buenos Aires. In 1815, Artigas attended the Congress of Oriente, a year before the Congress of Tucuman, held in Arrollo de la China (today known as Concepción del Uruguay). It was at this congress that the provinces of the Oriental Province (today the country of Uruguay), Córdoba, Corrientes, Entre Ríos, Misiones and Santa Fe declared themselves independent from Spain and formed the Liga Federal ("Federal League"). The Liga Federal invited other