[256] Brig Op Plan 7-50. At 1600 on 9 August, the Brigade was relieved of mopping up duties in the Chindong-ni area, leaving 2/5 immediately available to the 5th Marines commander. The 3d Battalion was delayed overnight by several hours of security duty until Army units could take over.[257] [257] This section is derived from: Annex How; Craig, 12 Jan 54; Zimmer, 18 Feb 54; Fegan and Bohn, 17 Apr 54; and Gall, 9 Feb 54. Lieutenant Colonel Roise’s battalion, having been relieved on Hill 342, entrucked at Sangnyong-ni in the evening and reached its assembly area near Hill 308 at 2100. Two hours later the unit marched southward on the new MSR to make the night attack on Paedun-ni. Passing through 1/5’s lines at 0115, 10 August, the weary Marines pressed on toward their target against no resistance. The point of the column included three M-26’s of First Lieutenant William D. Pomeroy’s tank platoon. At 0500, with the advance elements only a short distance from Paedun-ni, the lead tank crashed through a concrete bridge. The badly damaged vehicle proved to be wedged immovably between the two abutments. The second tank, while attempting to negotiate a narrow bypass next to the bridge, threw a track in the center of the stream and stalled the long column behind. Two hours elapsed before the advance could be resumed. South Korean laborers constructed a bypass for light vehicles next to the bridge, and an engineer tractor-dozer arrived to build a detour for heavy trucks and tanks. [Illustration: SACHON OFFENSIVE SITUATION MAP FOR 8–10 AUG. ’50] Reaching Paedun-ni at 0800, 2/5 reconnoitered the town and found it clear of enemy. By 0930 the battalion column was reformed and pounding the dusty road south. Murray decided to shuttle troops by truck from Paedun-ni to Kosong, since the 8-mile stretch was believed to be free of enemy. The heavier vehicles being tied up at the collapsed bridge, some delay resulted in motorizing the first increment of 2/5. General Craig arrived on the scene by helicopter in mid-morning. Not satisfied with the progress of the advance, he ordered Murray and Roise to march on Kosong with “all speed.” When the infantry column was a short distance out of Paedun-ni, the 5th Marines commander managed to get five 2½-ton trucks forward to help transport the first serial to the target. A motorized column was formed of 4 lead jeeps carrying a Reconnaissance Company detachment, followed by part of Company D aboard 6 more jeeps and the 5 trucks. Owing to the shortage of vehicles, Captain Zimmer’s first echelon included only the 1st and 2d Platoons, the 60-mm. mortars, an assault squad, and one machinegun section. Lacking either air or artillery support, the column rolled southward with orders to occupy Kosong and coordinate a defense of the city with its mayor. The remainder of 2/5 continued on foot until more vehicles could be provided.