 In 1811, José Gervasio Artigas, who became Uruguay's national hero, launched a successful revolt against Spain, defeating them on 18 May in the Battle of Las Piedras.In 1813, the Banda Oriental was renamed to Provincia Oriental, becoming part of the United Provinces of the Río de la Plata.In 1814, Artigas formed the Liga Federal (Federal League) of which he was declared Protector.