 The ROK 21st Regiment , 8th Division 's southernmost unit , moved to counter the amphibious attack . The regiment 's 1st Battalion moved from Bukp 'yong into the Okgye area and ambushed forward elements of the 766th in conjunction with local police and militia forces . They were able to drive back the 766th Regiment 's northern advance . However , at least one of the 766th Regiment 's battalions massed at Bamjae , blocking one of the 8th Division 's main supply routes . ROK troops mustered a civilian militia to help fight the North Koreans , which was only moderately effective . The embattled ROK 8th Division was forced to withdraw under overwhelming attacks and breakdowns in communication on July 27 . With the retreat of the ROK 6th Division , the entire ROK eastern flank was forced back . The 766th Regiment had been successful in establishing a bridgehead and disrupting communications in the initial attack . 
 The ROK 21st Regiment , 8th Division <a href='null_genetive' title='1'><mark>'s</mark></a>southernmost unit , moved to counter the amphibious attack . The regiment <a href='null_genetive' title='2'><mark>'s</mark></a>1st Battalion moved from Bukp <a href='null_genetive' title='3'><mark>'</mark></a>ong into the Okgye area and ambushed forward elements of the 766th in conjunction with local police and militia forces . They <a href='uninflect' title='4'><mark>were</mark></a> able to drive back the 766th Regiment <a href='null_genetive' title='5'><mark>'s</mark></a>northern advance . However , at least one of the 766th Regiment <a href='null_genetive' title='6'><mark>'s</mark></a>battalions massed at Bamjae , blocking one of the 8th Division <a href='null_genetive' title='7'><mark>'s</mark></a>main supply routes . ROK troops mustered a civilian militia to help fight the North Koreans , which was only moderately effective . The embattled ROK 8th Division was forced to withdraw under overwhelming attacks and breakdowns in communication on July 27 . With the retreat of the ROK 6th Division , the entire ROK eastern flank was forced back . The 766th Regiment had been successful in establishing a bridgehead and disrupting communications in the initial attack . 
Da ROK 21st Regiment , 8th Division  southernmost unit , moved to counter the amphibious attack . The regiment  1st Battalion moved from Bukp  ong into tdaOkgye area and ambushed forward elements of thda66th in conjunction with local police and militia forces . They was able to drive bacc the 766th Regiment  northern advance . However , at least one of theda6th Regiment  battalions massed at Bamjae , blocking one of the da Division  main supply routes . ROK troops mustered a civilian militia to help fight the North Koreans , which was only moderately effective . The embattled ROK 8th Division was forced to withdraw under overwhelming attacks and breakdowns in communication on July 27 . With the retreat of the Rda6th Division , the entire ROK eastern flank was forced back . The 766th Regiment had been successful in establishing a bridgehead and disrupting communications in the initial attack .