 The allies decided to divide their forces into two armies : a multinational force that included the 1st Division and a second army composed entirely of Brazilians under Caxias . The 1st Division led by Marques de Sousa , along with Uruguayan and Argentine rebel troops , invaded Argentina . He found the long march to Buenos Aires , the Argentine capital , highly uncomfortable . He had spent his life up to that point fighting Hispanic @-@ Americans , and he was now marching as their ally , surrounded by them . He did not trust them , and they trusted neither him nor his men . The only person among the allies with whom he shared his thoughts , and <unk> at that , was Domingo Faustino Sarmiento ( later president of Argentina ) : " We [ Brazilians ] form in here a separate group ; we do not talk to anyone ; no one approaches us and we could say that we walk among enemies . " On 3 February 1852 , in the Battle of Caseros , they faced Rosas and his army . The allies were victorious , Rosas fled to the United Kingdom , and Marques de Sousa acquired his carriage as a war trophy . 
