José de San Martín Manuel Rodríguez had returned to Chile before the crossing, and began a guerrilla war in Santiago de Chile against the royalists, in support of the upcoming army. He was supported in the south of the city and the countryside. The strategy was to occupy nearby villages, seize the royalists' weapons and flee. The attacks on Melipilla and San Fernando, and a failed one at Curicó, demoralized the royalists. The columns that crossed the Andes began to take military actions. The column in the north led by Cabot defeated the royalists in Salala, seized Coquimbo and then Copiapó. In the south,
Army of the North a victory at Utarango but was later defeated on 12 February by the San Juan river. Rondeau received an order to retreat to Tucumán. The army, almost beaten, marched for nine months going through Potosí and Humahuaca until reaching Tucumán. On 7 August 1816 at Trancas, Rondeau was replaced again by Manuel Belgrano. Martín Miguel de Güemes was named commander of the northern border. Belgrano moved the army to the citadel built by San Martín in the city of Tucumán. There he attempted to rebuild the morale, and materials, in search for a new action in Upper Peru, combining with