Viceroyalty of Peru arrived in Lima with Antonio José de Sucre to plan the offensive. In February 1824 the royalists briefly regained control of Lima. Olañeta's Rebellion started by surprise and the entire royalist army of Upper Peru (today's Bolivia) revolted, led by Pedro Antonio Olañeta (royalist) against La Serna, the viceroy of Peru (a liberal). This broke the royal army and started a civil war in Upper Peru. Having regrouped in Trujillo, Bolívar in June led his rebel forces south to confront the Spanish under Field Marshal José de Canterac. The two armies met on the plains of Junín on August 6,
Campaign of Sucre in Upper Peru to invade Upper Peru to Potosí. Royalist general Pedro Antonio Olañeta, hearing of the defection half of his forces under Col Medinaceli, and passed to the patriots, Olañeta attack them on April 1, 1825. Olaneta wound in combat fell to the ground. His soldiers surrender. Olaneta died the following day, April 2. That same day Col.Medinaceli referred the part of the battle to Marshal Sucre, who ended the military campaign. Campaign of Sucre in Upper Peru Campaign of Sucre in Upper Peru was a set of military operations conducted by the Liberator United Army of Peru to dislodge the Spanish