 During the last week of August , US troops on these hills could see minor North Korean activity across the river , which they thought was North Koreans organizing the high ground on the west side of the Naktong against a possible American attack . There were occasional attacks on the 9th Infantry 's forward positions , but to the men in the front lines this appeared to be only a standard patrol action . On August 31 , the UN forces were alerted to a pending attack when much of the Korean civilian labor force fled the front lines . Intelligence officers reported an attack was coming . 
 During the last week of August , US troops on these hills could see minor North Korean activity across the river , which they thought was North Koreans organizing the high ground on the west side of the Naktong against a possible American attack . <a href='dey_it' title='1'><mark>There</mark></a> <a href='uninflect' title='2'><mark>were</mark></a> occasional attacks on the 9th Infantry <a href='null_genetive' title='3'><mark>'s</mark></a>forward positions , but to the men in the front lines this appeared to be only a standard patrol action . On August 31 , the UN forces <a href='uninflect' title='4'><mark>were</mark></a> alerted to a pending attack when much of the Korean civilian labor force fled the front lines . Intelligence officers reported an attack was coming . 
During the last week of August , US troops on these hills could see minor North Korean activity across the river , which they thought was North Koreans organizing da high ground on tdawest side of thdaaktong against a possible American attack . It was occasional attacks on the 9th Infantry  forward positions , but to thedan in the front lines dis appeared to b only a standard patrol action . On August 31 , the daforces was alerted to a pending attack when much of the Kdaan civilian labor force fled the front lines . Intelligence officers reported an attack was coming .