On May 13, 1810, the arrival of a British frigate in Montevideo confirmed the rumors circulating in Buenos Aires: France, led by Emperor Napoleon, had invaded Spain, capturing and overthrowing Ferdinand VII Bourbon, the Spanish King.
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The first Federalist leader in the Platine Region was José Gervasio Artigas, who opposed the centralist governments in Buenos Aires that followed the May Revolution, and created instead the Federal League in 1814 among several Argentine Provinces and the Banda Oriental (modern-day Uruguay).
During his rule, Saavedra and Campana were exiled, Montevideo fell to the United Provinces but serious problems arose with José Gervasio Artigas and the Liga Federal on the Banda Oriental.