 Of all the North Korean attacks along the Pusan Perimeter , the Second Battle of Naktong Bulge is seen by historians as the most serious threat . It was the battle in which the North Koreans made the most substantial gains , splitting the US 2nd Infantry Division in half and briefly capturing Yongsan , where they were very close to breaching through to the US forces ' supply lines and threatening other divisions ' rear areas . However , once again the fatal weakness of the North Korean Army had cost it victory after an impressive initial success — its communications and supply were not capable of exploiting a breakthrough and of supporting a continuing attack in the face of massive air , armor , and artillery fire that could be concentrated against its troops at critical points . By September 8 , the North Korean attacks in the area had been repulsed . 
 Of all the North Korean attacks along the Pusan Perimeter , the Second Battle of Naktong Bulge is seen by historians as the most serious threat . It was the battle in which the North Koreans made the most substantial gains , splitting the US 2nd Infantry Division in half and briefly capturing Yongsan , where they <a href='uninflect' title='1'><mark>were</mark></a> very close to breaching through to the US forces <a href='null_genetive' title='2'><mark>'</mark></a>supply lines and threatening other divisions <a href='null_genetive' title='3'><mark>'</mark></a>rear areas . However , once again the fatal weakness of the North Korean Army <a href='been_done' title='4'><mark>had</mark></a> cost it victory after an impressive initial success — its communications and supply <a href='negative_concord' title='5'><mark>were</mark></a> <a href='negative_concord' title='6'><mark>not</mark></a>capable of exploiting a breakthrough and of supporting a continuing attack in the face of massive air , armor , and artillery fire <a href='null_relcl' title='7'><mark>that</mark></a>could be concentrated against its troops at critical points . By September 8 , the North Korean attacks in the area <a href='been_done' title='8'><mark>had</mark></a> been repulsed . 
Of all the North Korean attacks along the Pusan Perimeter , the Second Battle of Naktong Bulge is seen by historians as the most serious threat . It was the battle in which the North Koreans made the most substantial gains , splitting the US 2nd Infantry Division in half and briefly capturing Yongsan , where they was very close to breaching through to the US forces  supply lines and threatening other divisions  rear areas . However , once again the fatal weakness of the North Korean Army done cost it victory after an impressive initial success — its communications and supply ain't capable of exploiting a breakthrough and of supporting a continuing attack in the face of massive air , armor , and artillery fire could b concentrated against its troops at critical points . By September 8 , da North Korean attacks in tdaarea done been repulsed .