The Battle Hostile_encounter of Happo was a naval engagement Hostile_encounter on May 7 , 1592 , one of the three Joseon naval campaigns Military_operation of 1592 conducted Action by Korean admiral Yi Sun-sin during Japanese invasions Attack of Korea ( 1592-1598 ) against the Japanese forces of Toyotomi Hideyoshi .

These campaigns Military_operation made Causation Yi a legendary figure in Korean History .

The campaigns Military_operation of Yi were vital in halting Preventing_or_letting the Japanese invasion Attack .

While intending to spend Expend_resource the night in the open sea following Motion the initial Battle Hostile_encounter of Okpo , Admiral Yi Sun-sin was forced Causation to change Change his plans due to a report of five large Japanese ships having been sighted Know heading Self_motion in the direction of Happo around 5 p.m .

Admiral Yi ’ s forces now had two victories under their belt .