 By 1828 , Brazil could no longer sustain the war effort in the south and in April relinquished Cisplatina , which became the independent nation of Uruguay . Marques de Sousa was sent to Montevideo to serve under field marshal ( present @-@ day divisional general ) Manuel Jorge Rodrigues , who commanded a Brazilian force temporarily stationed in the new country . On 29 March 1829 , Marques de Sousa was made brevet ( acting ) major , and , on 28 August 1830 , he was placed in command of the 6th company of 4th Regiment of Light Cavalry . Stationed in Rio Grande do Sul , the unit had previously been commanded by his father and his paternal grandfather . 
