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The Army of the North (Spanish: Ejército del Norte), contemporaneously called Army of Peru, was one of the armies deployed by the United Provinces of the Río de la Plata in the Spanish American wars of independence. Its objective was freeing the Argentine Northwest and the Upper Peru (present-day Bolivia) from the royalist troops of the Spanish Empire
The offensive operations started in 1810 and ended in 1817, with the defeat of the forces commanded by Gregorio Aráoz de La Madrid at the battle of Sopuchay, the last attempt to advance into Upper Peru. Since then, only defensive operations on the Northern frontier were carried on, as the offensive had been transferred to the Army of the Andes, commanded by José de San Martín, who devised the strategy of reaching the main royalist stronghold, Lima, through Chile. In 1820 the Army of the North was summoned to intervene in the internal strife between the central government in Buenos Aires and the Federal League provincial caudillo leaders. Shortly after, the Arequito Revolt led by the independentist veterans who refused to fight a civil war instead of an independence war, effectively ended the existence of the Army of the North...