The Oei Invasion (known in Korea as the Gihae Eastern Expedition, with Gihae being a reference to the year 1419) refers to a raid on the Japanese island of Tsushima by Joseon Korean forces that occurred in 1419 (the 26th year of the Oei era, from which the Japanese name is taken), meaning that it took place during the Muromachi period according to the standard classification of Japanese history.
応永の外寇（おうえいのがいこう、朝鮮では己亥東征と称す）とは、日本史の時代区分では室町時代の1419年（応永26年）に起きた、李氏朝鮮軍による対馬国襲撃をさす。