Operation: Hollow Storm was a two day long massive military counterattack, which had directly aimed to kill the remaining Locust that survived the Lightmass Offensive. It would be a pyrrhic victory for the COG, though with thousands of Gears killed, captured or missing in the attack on the Hollows, and an unknown amount of vehicles and equipment lost during the trek to Landown City. However, the most devastating loss was the last COG stronghold Jacinto City, which was sunk in a last ditch attempt to destroy the Locust by flooding the Hollows. The events of the operation led to the discovery of the Locust Civil War and the destruction of Nexus. The flooding killed an untold amount of Locust soldiers and creatures, but some escaped.