 For the Home @-@ by @-@ Christmas Offensive , US 25th Infantry Division of the IX Corps advanced on the left of the US 2nd Infantry Division along the Kuryong River , one of the northern tributaries of the Ch 'ongch 'on River . On November 24 , the 25th Infantry Division started its offensive at the city of <unk> , south of Ipsok . To lead the offensive , five companies of infantry , armor and artillery were drawn from the 25th Infantry Division to form a special task force named " Task Force Dolvin " . With Task Force Dolvin leading the offensive on the eastern bank of the Kuryong River , the US 24th Infantry Regiment of the 25th Infantry Division was placed on division 's right to maintain contact with the 2nd Division , while the US 35th Infantry Regiment of the 25th Infantry Division was on the western bank of the river advancing from Yongsan @-@ dong to Unsan . The 27th Infantry Regiment of the 25th Infantry Division was located in the division 's rear as reserves . 
