Ōei Invasion

Korean campaign against Tsushima
Korean campaign against Tsushima
Japanese name
Kyūjitai	應永の外寇
Shinjitai	応永の外寇
Revised Hepburn
Transcriptions
Revised Hepburn	Ōei no gaikō
Kunrei-shiki	Ôei no gaikô
Korean name
Hangul	제삼차 대마도 정벌
Hanja	第三次對馬島征伐
Revised Romanization
Transcriptions
Revised Romanization	Jesamcha Daemado Jeongbeol
McCune–Reischauer	Chesamch'a Taemado Chŏngbŏl
Alternative Korean name
Hangul	기해동정
Hanja	己亥東征
Revised Romanization
Transcriptions
Revised Romanization	Gihae Dongjeong
McCune–Reischauer	Kihae Tongjŏng

Ōei Invasion
Date	June 20, 1419 – July 3, 1419; (1 week and 6 days)
Location	Tsushima Island, Japan
Result	Inconclusive
Belligerents
Wokou pirates; Sō clan	Joseon dynasty
Commanders and leaders
Sō Sadamori	Yi Chongmu; Pak Sil; Yi Sun-mong; Kim Hyo-sung
Strength
600	17,285 200 ships
Casualties and losses
Korean records:; 129 ships; 1,939 destroyed homes 114 dead (executed); 21 captured; Japanese records: 123 dead	Korean records:; Over a hundred; 180 dead; Japanese records: 2,500–3,700 dead

The Ōei Invasion (応永の外寇, Ōei no gaikō), also known as the Gihae Expedition (Korean: 기해동정; Hanja: 己亥東征; RR: Gihae dongjeong), was a 1419 Joseon invasion of Tsushima Island, which is located in the middle of the Tsushima Strait between the Korean Peninsula and Kyushu.

The third and largest suppression of Tsushima (對馬島征伐) took place in 1419 (first year of the reign of Sejong), named after the zodiac of that year. It was preceded by the first suppression that took place in February 1389 and the second from December 1396. Both ended with the goal of eradicating pirate activity in the area. It is named after the hexagenerian zodiac of that year.

The Japanese identifying phrase derives from the Ōei era (1394–1428), which is the Japanese era name of the calendar system in use in Japan.