The Battle of Angamos (Spanish: Combate de Angamos) was a naval encounter of the War of the Pacific fought between the navies of Chile and Per at Punta Angamos, on 8 October 1879. The battle was the culminating point of a naval campaign that lasted about five months in which the Chilean Navy had the sole mission of eliminating its Peruvian counterpart. In the struggle, two armored frigates, led by Commodore Galvarino Riveros Crdenas and Navy Captain Juan Jos Latorre battered and later captured the Peruvian monitor Huscar, under Rear Admiral Miguel Grau Seminario.

After the loss of the frigate Independencia at Punta Gruesa, Grau sought to challenge the outnumbering Chilean fleet adopting a harassing strategy, focused in inflicting as much damage as possible while avoiding a full scale engagement. As Grau evolved along the Pacific coast, he was chased by Admiral John Williams Rebolledo, who had been ordered to catch Grau no matter what. His failure cost him his commission, and was replaced by Riveros.

With a different strategy, Riveros managed to encircle Grau at Punta Angamos, about 80 kilometers north of Antofagasta. Falling in a trap set by Riveros and Latorre, Grau was forced to present battle after ordering the corvette Unin to escape to Per.

Latorre, aboard Almirante Cochrane, engaged first. Taking advantage of the powerful Armstrong-type batteries with armour-piercing projectiles, Latorre shelled Huscar for almost two hours, the monitor Huascar only with ordinary elongated shot could cause small damages to the Chilean ironclads and Grau was killed in action. However, his flagship continued the fight while Riveros engaged her with the Blanco Encalada as well. After being battered for almost three hours, the Huscar, unable to sustain combat, was boarded and captured and the battle ended.

The result was a complete success for the Chilean Navy, and secured its dominant position for the rest of the war. It allowed to prepare the invasion of the Tarapac department, carried out on early November.

Chilean Navy dominance off the Pacific coast contributed significantly to success in the following land campaigns across the Atacama Desert that ended with Lima's fall in January 1881.

The Huscar was repaired and served under the Chilean flag until its decommission, and now sits as a floating museum in the port of Talcahuano.

The War of the Pacific (Spanish: Guerra del Pacífico), also known as the Saltpeter War (Spanish: Guerra del salitre) and 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 a Chilean victory, which gained for the country a significant amount of resource-rich territory from Peru and Bolivia.

The war began over a nitrate taxation dispute between Bolivia and Chile, with Peru being drawn in due to its secret alliance with Bolivia. But historians have pointed to deeper origins of the war, such as the interest of Chile and Peru in the nitrate business, the long-standing rivalry between Chile and Peru, as well as political and economical disparities between Chile and Peru and Bolivia. On February 14, 1879, Chile's armed forces occupied the Bolivian port city of Antofagasta, subsequently war between Bolivia and Chile was declared on March 1, 1879, and between Chile and Peru on April 5, 1879.

Battles were fought in the Pacific Ocean, the Atacama Desert, the Peruvian deserts, and the mountainous interior of Peru. For the first five months, the war played out in a naval campaign, as Chile struggled to establish a marine resupply corridor for its forces in the world's driest desert. Afterwards, Chile's land campaign bested the Bolivian and Peruvian armies. Bolivia withdrew after the Battle of Tacna, on May 26, 1880. Chilean forces occupied Peru's capital Lima in January 1881. Remnants and irregulars of the Peruvian army waged a guerrilla war but could not prevent war-weary Peruvian factions from reaching a peace deal with Chile involving territorial cessions.

Chile and Peru signed the Treaty of Ancón on October 20, 1883. Bolivia signed a truce with Chile in 1884. Chile acquired the Peruvian territory of Tarapacá, the disputed Bolivian department of Litoral (turning Bolivia into a landlocked country), and the temporary control over the Peruvian provinces of Tacna and Arica. In 1904, Chile and Bolivia signed the Treaty of Peace and Friendship, which established definite boundaries. The 1929 Tacna–Arica compromise gave Arica to Chile and Tacna to Peru.