The naval Incident of Pacocha took place on 6 May 1877 when Nicolas de Pierola was leading a revolution to overthrow then Peruvian President Mariano Ignacio Prado. Piérola used the Peruvian monitor Huáscar as a raiding ship. It practiced sabotage primarily against the government forces of Peru. However, after it intercepted some British merchant ships, the British sent Rear Admiral de Horsey to capture the vessel. The Peruvian vessel managed to escape the battle under the cover of darkness, but was forced to surrender to the Peruvian government just 2 days later.