 Caballero participated in the Battle of Tacuarí and Battle of Paraguari against the army led by Manuel Belgrano.Paraguayan victory at the January 19, 1811 Battle of Paraguari forced Belgrano to retreat southward.On March 9, 1811, on the banks of River Tacuarí, while Belgrano awaited reinforcements from Buenos Aires, another battle was launched and won by Paraguayans.