The War of the Confederation (Spanish: Guerra de la Confederación) was a military confrontation waged by the United Restoration Army, the alliance of the land and naval forces of Chile and the Restoration Army of Peru, formed in 1836 by Peruvian soldiers opposed to the confederation, and the Argentine Confederation against the Peru–Bolivian Confederation between 1836 and 1839. As a result of the Salaverry-Santa Cruz War, the Peru-Bolivia Confederation was created by General Andrés de Santa Cruz, which caused a power struggle in southern South America, with Chile and the Argentine Confederation, as both distrusted this new and powerful political entity, seeing their geopolitical interests threatened. After some incidents, Chile and the Argentine Confederation declared war on the Peru-Bolivian Confederation, although both waged war separately.
Chile since 1836 carried out the war with Peruvian dissidents who were enemies of Santa Cruz. During the war, one of Santa Cruz's subordinates, General Luis José de Orbegoso, rebelled against him in 1838 to restore Peru with a new government. However, by not allying with Chile, he ended up being defeated by Chilean forces. On the other hand, the Argentine Confederation did not achieve any significant advance between 1837 and 1838, paralyzing its war front and losing some territories north of Jujuy, notwithstanding the importance for the Rosas government of the war against Bolivia as an instrument of political cohesion at the level of the Argentine Confederation, Rosas had enemies and problems on many fronts, among which it is worth mentioning the intrigues of the unitary emigrants in the Banda Oriental (Uruguay) and Chile, and the problem posed to the commercial interests of Buenos Aires by the conflict with France, which would soon lead to the French blockade of the Río de la Plata. Due to the presence of these multiple conflicts, Rosas could not divert his attention or his resources in the war he had decided against Bolivia.[17] Finally, Chilean-Peruvian forces of the so-called Restorative Army led by General Manuel Bulnes, obtain a decisive victory in the battle of Yungay in 1839 while Andrés de Santa Cruz had been overthrown from the post of President of Bolivia by general José Miguel de Velasco who betrayed him before knowing the result of the battle. At the same time the general José Ballivián leaving the battlefield and mutinied in La Paz along with Bolivian reserve battalions. Also Colonel Guilarte, who had 700 soldiers in command, had abandoned his position and deserted without firing any shots.[18][19] This battle caused the dissolution of the Peru-Bolivian Confederation, the exile of Santa Cruz, the restoration of Peru and Bolivia, among other consequences.
Historians have proposed different long-lasting effects of the war including the consolidation of the ideas of Peruvian and Chilean nationality.[20]
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