"Algol" returned to Inchon on 8 October and embarked Headquarters Company, 1st Ordnance Battalion, 1st Marine Division, for what was to have been an amphibious assault at Wonsan on the northwestern coast of Korea. However, United Nations (UN) naval gunfire and air activity forced the North Koreans back from the coastal plain into the highlands. This enabled Republic of Korea forces ashore to move northward and occupy Wonsan themselves. UN troops, therefore, landed unopposed during the last week in October. Following that, the ship returned to Japan and remained there until early December.