José de San Martín was defeated by the Luso-Brazilian armies, his allies Estanislao López and Francisco Ramírez continued hostilities against Buenos Aires for its inactivity against the invasion. Pueyrredón called the Army of the Andes and the Army of the North (led by Belgrano) to aid Buenos Aires in the conflict. Guido noted to San Martín that if both armies did that, the north of Argentina and Chile would be easily reconquered by the royalists. San Martín also knew that most of the soldiers of the Army of the Andes would not be willing to aid Buenos Aires in the civil war, as most
José de San Martín Nearly 700 expeditionary soldiers of New Granada deserted and joined the patriots. Several populations in the north of Peru supported San Martín, and Arenales defeated the royalists at the Battle of Pasco. More than 300 royalists joined the patriots, including Andrés de Santa Cruz. However, the plans did not fully work as intended. The native populations that joined Arenales could not resist the royalist counter-attacks, and the slaves did not join the army in the expected numbers. The Argentine provinces could not send the supporting army that San Martín had requested earlier, and the Army of the North no longer