Spanish ironclad Numancia in the context of Canton of Cartagena

The Chincha Islands War, also known as Spanish–South American War (Spanish: Guerra hispano-sudamericana), was a series of coastal and naval battles between Spain and its former colonies of Peru, Chile, Ecuador, and Bolivia from 1865 to 1879. The conflict began with Spain's seizure of the guano-rich Chincha Islands in one of a series of attempts by Spain, under Isabella II, to reassert its influence over its former South American colonies. The war saw the use of ironclads, including the Spanish armoured frigate Numancia, the first ironclad to circumnavigate the world.

The Spanish Navy, officially the Armada, is the maritime branch of the Spanish Armed Forces and one of the oldest active naval forces in the world. The Spanish Navy was responsible for a number of major historic achievements in navigation, the most famous being the discovery of North America and the first global circumnavigation. For several centuries, it played a crucial logistical role in the expansion and consolidation of the Spanish Empire, and defended a vast trade network across the Atlantic Ocean between the Americas and Europe, and the Manila Galleon across the Pacific Ocean between the Philippines and the Americas.

The Spanish Navy was one of the most powerful maritime forces in the world from the late 15th century to mid-18th century. In the early 19th century, with the loss of most of its empire, the Spanish navy transitioned to a smaller fleet but it still maintained a significant shipbuilding capability and produced the first fully capable military submarine. In this time, the Spanish navy also contributed to the development of the destroyer class of warship and achieved the first global circumnavigation by an ironclad vessel.