 The ROK 21st Regiment , 8th Division 's southernmost unit , moved to counter the amphibious attack . The regiment 's 1st Battalion moved from <unk> <unk> into the <unk> 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 <unk> , 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 <unk> 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 . 
