 That same afternoon , the North Koreans sent an American prisoner up the hill to <unk> with the message , " You have one hour to surrender or be blown to pieces . " <unk> in frontal infantry attack to reduce the little defending force , the North Koreans now meant to take it under mortar fire . Only 45 minutes later North Korean <unk> fire came in on the <unk> and two machine guns from positions northward and higher on the slope of Hill <unk> swept the perimeter . Soon , mortars <unk> on a neighboring high finger ridge eastward registered on <unk> 's perimeter and continued firing until dark . The machine gun fire forced every man to stay in his <unk> . The lifting of the mortar fire after dark was the signal for renewed North Korean infantry attacks , all of which were repulsed . But the number of killed and wounded within the perimeter was growing , and supplies were diminishing . There were no medical supplies except those carried by one aid man . 
