The allied troops united under the command of Mitre in the camp of Concórdia, in the Argentine province of Entre Ríos, with the field-marshal Manuel Luís Osório at the front of the Brazilian troops.
De allierede tropper samlede sig under kommando af Mitre i Concórdia-lejren i den argentinske provins Entre Ríos, med feltmarskalk Manuel Luís Osório i front for de brasilianske tropper.