eastern front except for the coastal area, had sidestepped westward into a narrow zone abutting on the reservoir for the attack in the Yanggu area. Moving south through the upper Soyang River valley from its assembly at Komisong, KPA V Corps had deployed in the vacated ground for the attack toward Inje. V Corps' commander, General Pang, chose to attack with his seasoned, if understrength, 6th and 12th Divisions, keeping in reserve the 32nd, a nearly full strength but green division that had replaced the 7th while the Corps was in Komisong. III Corps' commander General Yu elected a different course, committing only the 45th Division in what would be its first offensive of the war, perhaps because it had a strength of 8600 men, more than twice the strength of either of Yu's other divisions. The deployment of the 45th Division set it against the US 23rd Infantry Regiment, 2nd Infantry Division at the edge of the reservoir above Yanggu and the 17th and 32nd Infantry Regiments of the 7th Infantry Division in the adjacent ground to the east. On the opposite wing of the KPA effort, the KPA 6th Division faced the ROK 3rd Division. At center, the 12th Division was poised for an attack in a zone straddling the US X Corps-ROK III Corps boundary and leading directly to Inje. Battle First offensive (22–30 April) ROK 6th Division collapses (22 April) During the afternoon of 22 April, IX Corps' airborne artillery observers located and brought down fire on a large enemy force concentrated ahead of the ROK 6th Division. Anticipating an attack, General Chang halted his division's advance toward the Wyoming Line about 16:00 and ordered his forward regiments, the 19th and 2nd, to develop defensive positions tied in with each other and with the 24th Division and 1st Marine Division on their respective outside flanks. Chang moved his reserve 7th Regiment into supporting positions immediately behind the 2nd Regiment, ahead of which more enemy forces had been observed than ahead of the 19th Regiment. Placing reserves so close to the front went against the recommendation of his Korean Military Advisory Group (KMAG) adviser, but Chang intended that this show of support would counter uneasiness that had begun to spread among his line forces at word of a probable PVA attack. IX Corps' commander General William M. Hoge moved three Corps' artillery units forward during the afternoon