On the night of 28 November, the PVA 80th Division attacked again with four regiments. At the inlet, the Chinese assault became a disaster as communications broke down, while devastating fire from the M16 and M19 anti-aircraft (AA) guns attached to the 57th Field Artillery Battalion swept the Chinese ranks. In the aftermath of the fighting, the PVA 238th and the 239th Regiment together had fewer than 600 soldiers. The attacks by PVA 240th Regiment, on the other hand, forced Maclean to order a retreat from the northern hills towards Sinhung-ni. On 29 November, the 1st Battalion managed to break through the Chinese blockade and reached the Sinhung-ni perimeter, but Maclean was lost when he mistook some Chinese soldiers for American. The Chinese finally stopped their attacks on the night of 29 November, while waiting for fresh reinforcements.