The Marine move was launched by Division Operation Plan 2-52 and provided that the 1st Marine Division would be relieved by the 8th ROK Division as a preliminary to movement overland and by sea to the relief of the 1st ROK Division and defense of Line JAMESTOWN in the I Corps sector in the west. According to verbal orders later confirmed by EUSAK OI 272, transportation by truck and ship was specified, and the move was to be completed prior to 1 April.[371] [371] Sources for this section are 1stMarDiv _HD_, Mar 52, 9–10; 1st MT Bn _HD_, Mar 52; 7th MT Bn _HD_, Mar 52. Obviously such a transplacement--moving entire divisions great distances from one sector of the MLR to another--necessitated careful timing and close coordination, but the planners involved were equal to the task. In referring to detailed plans by the Division G-3 Section (Lieutenant Colonel Gordon D. Gayle) and the G-4 Section (Colonel Robert A. McGill), several unit commanders expressed the opinion that “the move from east to west was a masterpiece of logistical efficiency with no unnecessary paper work and no undue harrassment.”[372] [372] Col T. A. Culhane, Jr., Comments, 4 Mar 59, and others. In addition to transporting the Division, the arrival of replacements and departure of personnel to be rotated to the United States were smoothly coordinated into the over-all plan. The transport _General W. H. Gordon_ anchored at Sokcho-ri on 16 March with 174 officers and 1,135 enlisted men of the 18th Replacement Draft. The newly arrived Marines scarcely had time to drop their seabags before they joined the motor march to West Korea. The _Gordon_ departed with 103 officers and 1,135 Marines homeward bound, and the 2d Logistical Command (Army) received a 1st Marine Division request to route the 19th Replacement Draft, due in April, to Inchon instead of Sokcho-ri. At K-50, near Sokcho-ri on the east coast, air freight and passenger service was discontinued and diverted to the new Division airhead, K-16, at Seoul. The Division railhead was changed to Munsan-ni (Map 22). The first Marine unit to depart for West Korea was the KMC Regiment with its organic battalion of artillery. Since the artillery had to be moved and repositioned all across the front with as little interruption as possible in overall support available at any one time, the 11th Marines CO planned to move his battalions directly into their new firing positions. This was preceded by an initial detailed reconnaissance. Elements of the U.S. 25th Infantry sideslipped to the right and assumed responsibility for the Marine sector on the 17th (Map 22), and the KMCs and the 1st Battalion, 11th Marines moved into their new positions on 18 March. The other artillery battalions followed at two-day intervals, all battalions firing from their new positions by 24 March.