[307] Smith, _Notes_, 472–473; G-3 _SAR_, 21. The previous day an A/Tks patrol had killed an estimated 150 NKs in a short fire-fight west of Munchon. 1stTkBn, _SAR_, 12. On 6 November, immediately after landing at Wonsan, the 65th RCT of the 3d Infantry Division (less one battalion, placed temporarily under 1st Marine Division control for the Majon-ni operation) was ordered by Corps to relieve elements of the 96th Field Artillery Battalion, USA, which had been recently sent to Yonghung. The Army RCT was assigned a mission of protecting the Yonghung-Kowon area and patrolling to the west (see map on Page 122).[308] [308] CG X Corps msg X12075, 5 Nov 50; Dolcater, _3d Infantry Division in Korea_, 69; Smith, _Notes_, 473. The Wonsan-Hamhung rail line took on special importance after the announcement that water transportation would be delayed until enemy mines were cleared from the harbor at Hungnam. This made it necessary for the 1st Marine Division to send daily supply trains from Wonsan.[309] The first two completed the run without incident, but after departing Wonsan at dusk on the 6th the third train was halted at Kowon by the destruction of rails ahead. North Korean guerrillas attacked the train, guarded by a lieutenant and 38 men from Company C of the 1st Amphibian Tractor Battalion.[310] [309] ComNavFE msg to CinCFE, 0010 12 Nov 50. [310] The account of the guerrilla attack at Kowon is derived from: 1stAmphTracBn _SAR_, 5–6; 1stAmphTracBn _HD_, _Nov 50_, 3; Statement of Pvt Richard J. Foster, n. d. The detachment was taken by surprise in the darkness by foes firing from both sides of the track. When the Marines attempted to reverse the train, the enemy wounded the engineer and put a hole in the boiler with grenades. In the darkness the guard became separated into two groups, the smaller of which was surrounded in a car. The guerrillas fired through the wooden sides, forcing the Marines to the floor, and threw grenades through the windows until all ten men were killed or wounded, only two of them surviving. The remaining 29 men of the guard made a stand on an embankment about 200 yards from the track. Six Marines were wounded in the ensuing fire fight. The train guard broke off the action and withdrew to the area of the Army artillery battalion. An empty train from Hamhung, guarded by a platoon from Company A of the Amtracs, was halted at 1700 on the afternoon of 6 November by railway officials at Yonghung. Reports of guerrilla activity in the area had proved to be only too well founded when elements of the 96th Field Artillery Battalion were attacked early that morning. Their perimeter south of the town was breached with losses to the Army unit of equipment and ammunition.