Kumhwa, but deliberately stood fast in the Kwangdok-san ridges to allow the neighboring ROK 6th Division to come abreast. In the Pogae-san heights, the 25th Division attacked toward Ch'orwon, but made no substantial progress after receiving increasing artillery fire during the day and becoming involved in hard fights right at the Utah Line, especially in the zone of the Turkish Brigade along Route 33. Neither Corps developed evidence of enemy offensive preparations during the day. The absence of opposition in the IX Corps' zone only confirmed the recent patrol reports of PVA/KPA withdrawal. Below the Iron Triangle, the resistance that began to stiffen on 19 April had been expected to grow progressively heavier as I Corps' forces moved above the Utah Line. On the Imjin River front, daylight patrols working above the river again found only a scattering of PVA. I Corps' commander General Frank W. Milburn concluded in an evening wrap-up report to General Van Fleet that the "enemy attitude remains defensive." On 21 April, the Eighth Army G-2 (intelligence officer) reported that his information still was not firm enough to "indicate the nearness" of the impending enemy offensive with any degree of certainty. A worrisome fact, as he earlier had pointed out to General Van Fleet, was that a lack of offensive signs did not necessarily mean that the opening of the offensive was distant. In preparing past attacks, PVA forces had successfully concealed their locations until they moved into forward assembly areas immediately before they attacked. In the US X Corps' zone north and northeast of Yanggu, US 2nd and 7th Infantry Division patrols, after several days of nearly fruitless searches, located several groups of 600-1000 immediately above the Corps' front. These groups suggested, as X Corps' commander General Edward Almond reported to Van Fleet, that a relief or reinforcement of enemy units was taking place. Aerial reconnaissance after daybreak on 22 April, reported a general forward displacement of enemy formations from rear assemblies northwest of I Corps and north of both I and IX Corps, also extensive troop movements, both north and south, on the roads above Yanggu and Inje east of the Hwacheon Reservoir. Though air strikes punished the moving troops bodies, air observers reported the southward march of enemy groups with increasing frequency during the day. On the basis of the sightings west of the Hwacheon Reservoir, it appeared that the enemy forces approaching