 On 3 March 1852 , Marques de Sousa was raised to the rank of field marshal , and Emperor Dom Pedro II conferred on him the noble title of Barão de Porto Alegre ( Baron of Porto Alegre ) . It was a reward for his victory at Caseros , but also a nod to his role in saving the capital of Rio Grande do Sul during 1836 . His exploits achieved great renown in Brazil , where he was referred to as the " Vanquisher of the Platine Tiger [ Rosas ] " . He replaced Caxias as head of the army that had fought in the war on 26 June , after its return to Brazil . Soon after , on 24 September , the Baron of Porto Alegre was removed from that post and made comandante das armas ( military commander ) of Rio Grande do Sul , a position he held until he requested to be relieved on 5 March 1853 . 
