On the other main approach to Yongdong , a road northwest of the city , heavy machine gun fire and 37-mm fire from A Battery of the 92nd Antiaircraft Artillery Battalion , and artillery fire from the 77th Field Artillery Battalion helped the 1st Battalion there to repel KPA attacks . However , the large numbers of civilian refugees crowding the Yongdong area trying to move south helped the KPA infiltrate the 1st Cavalry Division 's positions . Eighth Army tried to control the refugee movement through the Korean National Police , permitting it only during daylight hours and along predetermined routes . The KPA continued to move into the city in civilian clothing with concealed weapons , and US troops started shooting any Koreans moving through their lines at night . The chain of command which issued these orders is not clear as they were generally not put on paper . However , these orders are thought to have contributed to war crimes committed against civilians by the 1st Cavalry Division , namely the No Gun Ri massacre , which took place around the time of the fighting at Yongdong . In the No Gun Ri incident , US soldiers are alleged to have killed a number of Korean civilians , believing them to be military infiltrators . By the morning of July 25 KPA forces had infiltrated the positions of the 1st Cavalry Division so thoroughly that they were disrupting its lines of supply , and Gay ordered the division to withdrawal and re-form its lines further south . Northwest of Yongdong , 1st Battalion executed an orderly withdrawal , covered by the fire of the Heavy Mortar Company and the two batteries of the 77th Field Artillery Battalion . The mortar operators fought as infantry in the withdrawal . During these retreats KPA troops disguised themselves as refugees and would form roadblocks in the UN troops ' rear areas , or used hidden communications equipment to inform higher commands of UN concentrations so those concentrations could be attacked when they were most vulnerable
No Gun Ri massacre
No Gun Ri massacre
Battle of Yongdong