Peru's movement toward independence was launched by an uprising of Spanish-American landowners and their forces, led by José de San Martín of Argentina and Simón Bolívar of Venezuela. San Martín, who had displaced the royalists of Chile after the Battle of Chacabuco, and who had disembarked in Paracas in 1819, led the military campaign of 4,200 soldiers. The expedition which included warships was organized and financed by Chile which sailed from Valparaíso in August 1820. San Martin proclaimed the independence of Peru in Lima on July 28, 1821, with the words "... From this moment on, Peru is free and independent, by the general will of the people and the justice of its cause that God defends. Long live the homeland! Long live freedom! Long live our independence!".
Still, the situation remained changing and emancipation was only completed by December 1824, when General Antonio José de Sucre defeated Spanish troops at the Battle of Ayacucho. Spain made futile attempts to regain its former colonies, such as at the Battle of Callao, and only in 1879 finally recognized Peruvian independence.

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