 During the North Koreans ' September 1 offensive , the US 25th Infantry Division 's US 35th Infantry Regiment was heavily engaged in the Battle of <unk> River north of <unk> . On the 35th Regiment 's right flank , just north of the confluence of the <unk> River and the <unk> River , was the US 9th Infantry Regiment , US 2nd Infantry Division . There , in the southernmost part of the 2nd Infantry Division zone , the 9th Infantry Regiment held a sector more than 20 @,@ 000 yards ( 18 @,@ 000 m ) long , including the <unk> area of the <unk> where the First Battle of <unk> <unk> had taken place earlier in August . Each US infantry company on the river line here had a front of 3 @,@ 000 feet ( 910 m ) to 4 @,@ 000 feet ( 1 @,@ 200 m ) and they held only key hills and observation points , as the units were extremely spread out along the wide front . 
