Chilean ironclad Blanco Encalada sunk at the Battle of Caldera Bay

Background. Blanco Encalada was a central battery ship commissioned in 1875, serving as the flagship during the War of the Pacific. In 1891, political tensions between President Balmaceda and Congress escalated into civil war. Congressionalists controlled existing naval vessels, while Balmacedists commandeered vessels nearing completion in England and France, including the torpedo boats Almirante Condell and Almirante Lynch.

Prelude to Engagement. In early April 1891, a portion of the revolutionary squadron, including Blanco Encalada, moved south for reconnaissance and anchored at Caldera. Balmacedist commanders of torpedo boats Almirante Condell and Almirante Lynch learned the frigate would be in the bay. They proposed an attack, which the Balmacedist government approved. The Congressionalists believed the torpedo boats would not attack the transports escorting the frigate.

Aftermath and Significance. Blanco Encalada sank in minutes after being hit by a torpedo from Almirante Lynch, resulting in the loss of 182 men. This event was the first instance of an ironclad warship being sunk by a self-propelled torpedo. The battle influenced naval weapons development, demonstrating the vulnerability of armored ships to torpedo attacks, a lesson later applied during the Russo-Japanese War.