The Battle of Chacabuco, fought during the Chilean War of Independence, occurred on February 12, 1817. The Army of the Andes

Army of the Andes

The Army of the Andes was a military force created by the United Provinces of the Río de la Plata and mustered by general José de San Martín in his campaign to free Chile from the Spanish Empire...

 of the United Provinces of the Río de la Plata led by General

General

A general officer is an officer of high military rank, usually in the army, and in some nations, the air force. The term is widely used by many nations of the world, and when a country uses a different term, there is an equivalent title given....

 Captain José de San Martín

José de San Martín

José Francisco de San Martín, known simply as Don José de San Martín , was an Argentine general and the prime leader of the southern part of South America's successful struggle for independence from Spain.Born in Yapeyú, Corrientes , he left his mother country at the...

 defeated the Spanish force led by Rafael Maroto. It was a defeat for the Captain Generalcy of Chile, the Spain-controlled government established after the division of the Viceroyalty of Peru

Viceroyalty of Peru

Created in 1542, the Viceroyalty of Peru was a Spanish colonial administrative district that originally contained most of Spanish-ruled South America, governed from the capital of Lima...

.
In 1814, having been instrumental in the establishment of a popularly elected congress in Argentina, José de San Martín

José de San Martín

José Francisco de San Martín, known simply as Don José de San Martín , was an Argentine general and the prime leader of the southern part of South America's successful struggle for independence from Spain.Born in Yapeyú, Corrientes , he left his mother country at the...

 began to consider the problem of driving the Spanish royalists from South America.