In June 1845 he sent an expedition to Santa Fe under former Governor Juan Pablo López's command, though without success.
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On April 1, 1843, the Madariaga brothers and some more officials crossed the Uruguay River near Uruguaiana, on what would later be known as the 'Paso de los Libres'.
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He helped Juan Lavalle form the army with which he conducted the campaign of Entre Rios in 1840.
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Governor Joaquín Madariaga gave command of his provincial army to general José María Paz, who in 1841 had obtained an impressive victory at the Battle of Caaguazú in Corrientes.