However, the sole purpose of the expeditionary force's invasion was to subjugate the Wako pirates, and Joseon Korea's demand that Tsushima become a vassal state was only an attempt to reassert Korea's titular control over Tsushima as an "outer domain" in order to encourage them to bring the Wako under control; it is difficult to find evidence of any suggestion that the Koreans were planning to make Tsushima a permanent vassal state.
だがこの遠征は倭寇制圧を目的とした侵攻に過ぎず、対馬の属州化要求も対馬が朝鮮の形式的な『外藩』であることを再確認させ倭寇を禁圧させるためのもので、恒久的な属国化を図る朝鮮側の意思は見出しがたい。