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On 4 September, General Haynes changed the boundary between the 38th and 23d Infantry Regiments, giving the northern part of the 23d's sector to the 38th Infantry, thus releasing Colonel Hutchin's 1st Battalion for movement southward to help the 2d Battalion defend the southern approach to Ch'angnyŏng. The 1st Battalion, 23d Infantry, about 1,100 men strong when the enemy attack began, was now down to a strength of approximately 600 men.

The 23d Infantry now made plans to concentrate all its troops on the position held by its 2d Battalion on the Pugong-ni - Ch'angnyŏng road. Colonel Hutchin succeeded in moving the 1st Battalion there and took a place on the left flank of the 2d Battalion. At the same time the regimental command post moved to the rear of this position. In this regimental perimeter, the 23d Infantry fought a series of hard battles. Simultaneously it had to send combat patrols to its rear to clear infiltrating enemy from Ch'angnyŏng and from its supply road.