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,
Geography of Peru Latin American and Caribbean States (CELAC), and the Pacific Alliance. The most populated city in the country is Lima the capital of Peru. Lima a metropolitan area has a population a little over 10 million. The second largest city in Peru Arequipa has a population of 989,919, and Trujillo is a growing city in the northern area of the country holds a population of 935,147. Peru's developed urban cities are found in coastal regions and to the north. There are 32.1 million people who live in Peru. The percentage of urbanization in Peru is 79.2%, and holds a yearly increase