War of the Pacific: Chile suffers its last military defeat in the Battle of La Concepción when a garrison of 77 men is annihilated by a 1,300-strong Peruvian force, many of them armed with spears.

The War of the Pacific, also known by multiple other names, was a war between Chile and a Bolivian–Peruvian alliance from 1879 to 1884. Fought over Chilean claims on coastal Bolivian territory in the Atacama Desert, the war ended with victory for Chile, which gained a significant amount of resource-rich territory from Peru and Bolivia.

The Battle of La Concepción was fought between Chilean and Peruvian forces on July 9 and 10, 1882, during the Sierra Campaign of the War of the Pacific. Heavily outnumbered, the Chilean detachment of 77 men under the command of Captain Ignacio Carrera Pinto was annihilated by a 1,300-strong Peruvian force, many of them armed with spears, commanded by Col. Juan Gasto and Ambrosio Salazar after a 27-hour fight in the small town of Concepción in the Peruvian Andes.