 Complete the following phrase:  In February 1824 the royalists briefly regained control of Lima. Olañetas Rebellion started by surprise and the entire royalist army of Upper Peru todays 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 