José Gervasio Artigas biography
In 1810 José Gervasio Artigas offered his services to the Buenos Aires junta that was leading an independence movement against Spain. After winning at Las Piedras, he besieged Spanish-held Montevideo for a time. He then became the champion of federalism against the efforts of Buenos Aires to assert centralized control. From 1820 he lived in exile in Paraguay. Uruguay achieved independence in 1828.