The series of events that caused General Kean to change the direction of DeChow's attack toward Kŏmam ni began at 0100, 3 September. The 1st Battalion, 35th Infantry, protruded farther westward at this time than any other unit of the U.N. forces in Korea. Back of its positions on Sibidang-san the main supply route and rear areas were in enemy hands, and only in daylight and under escort could vehicles travel the road.
On Sibidang-san the battalion had held its original positions after the heavy fighting of pre-dawn 1 September, completely surrounded by barbed wire, booby traps, and flares, with all supporting weapons inside its tight perimeters. The battalion had the advantage of calling by number for previously zeroed and numbered protective fires covering all approaches, which were quickly delivered. An hour after midnight an unusually heavy enemy assault struck the battalion.
The fight there continued until dawn 3 September, when the 1st Battalion, 35th Infantry, counted 143 enemy dead in front of its positions, and on that basis estimated that the total enemy casualties must have been about 500 men. [24-47]
In this night battle the 64th Field Artillery Battalion gave invaluable support to the 1st Battalion and became directly involved itself in the fighting. About fifty North Koreans infiltrated before dawn to A Battery's position and delivered a banzai-type assault.