Ikoku keigobanyaku was a military service of guarding the coastlines, including the Hakatawan Bay, which was thought to be a potential target of the Yuan's invasion, and the service continued for a certain period of time, led by Shugo (formed in four groups, replaced in every March).
守護に従い、一定期間（4番編成・3月勤番）、博多湾など元の襲来が危惧される沿岸を警備する軍役である。