In April 1864 , Brazil sent Sending Minister Plenipotentiary José Antônio Saraiva to negotiate Communication with Atanasio Aguirre , who had succeeded Berro in Uruguay .

Saraiva made Manufacturing an initial attempt to settle the dispute between Blancos and Colorados .

On 10 August 1864 , after a Brazilian ultimatum was refused Agree_or_refuse_to_act , Saraiva declared Expressing_publicly that Brazil 's military would begin Process_start exacting reprisals .