In late January Colonel Kim Sung Eun's 1st Korean Marine Corps Regiment (KMC) joined the 1st Marine Division. The Korean Marine regiment brought four rifle battalions (1st, 2nd, 3rd and independent 5th). The original Korean Marines had trained under the tutelage of the 5th Marines while en route to Inchon the previous September. They fought well beside the 1st Marine Division during the liberation of Seoul before being detached for other duties. The Korean Marines were attached administratively to the 1st Marine Division on 21 January, but were not trucked up from Chinhae until about a week later. On 29 January the KMC command post was in place at Yongdok. General Smith created a new sector in the northeast to accommodate the new arrivals.