Any intent of preserving the local governments previous to the revolution were considered hostile; and as a consequence two military campaigns were launched to suppress the resistance, one to Upper Peru and another to Paraguay, whose Spanish governor, Bernardo de Velasco, had refused to recognize the Junta and had received political support from the Cabildo of Asunción.

There he received news that the situation was worsening at the Banda Oriental, so the Junta was ordering him to end the Paraguay campaign soon so he could help in the new theater of operations.

This flotilla, composed of three small ships under the command of Juan Bautista Azopardo was defeated on March 2, 1811, at San Nicolás de los Arroyos, so Belgrano was left without reinforcements.

The vanguard was under the command of Fulgencio Yegros and the main army under General Manuel Cabañas, with a total of 3,000 men, plus a reinforcement of three pieces of artillery.

I'll be ready from tomorrow to commence hostilities on the enemy with no respite until Saturday when I plan to subject him to three attacks ... [the plan] is to go by the bridge ... with four pieces of artillery and a thousand men and attack suddenly if possible in that area and in front ... [supported] from a raft and two boats I have posted at the mouth of the Tacuary.On March 8 a bridge over the river was finished and the Paraguayan troops commenced to cross.

In first place, he succeeded in extracting an important part of the army from Paraguay, about 400 men, including the prisoners captured with Machain.

These men would form the future United Provinces army that would fight at the Banda Oriental (present-day Uruguay), supporting the local militia commanded by José Artigas.

Finally, the government decided on August 9, 1811, to absolve him of all charges and published the verdict in the Buenos Ayres Gazette[4] ...it is declared that General Manuel Belgrano, of the Army of the North, has conducted himself in command of the army with courage and deserves the recognition of the motherland...There is an Argentine myth about a child called the "Drummer of Tacuarí" who would have been involved in the battle.

It is said that it was a 12 years old child, acting as military drummer in the first lines of battle, being guide of the above-mentioned commander Celestino Vidal and was playing a snare drum.

This is the only Argentine Military band to have a child play as a military musician, in tribute to the young drummer from Concepcion del Uruguay who used his talent, at the cost of his life, to bring victory to the Argentine forces and would result, indirectly, in Paraguay's independence days after, with several of the victorious royalist officers and soldiers supporting it.