 North Korean forces , meanwhile , flanked the American positions under cover of fog . The Koreans passed around the Americans ' right flank and attacked the mortar positions in the rear . T @-@ 34 tanks also joined in the fight , and also passed around the American flanks while obscured by the fog . Around 0900 the North Korean forces in Chonui initiated a frontal assault on the 1st Battalion , 21st Infantry 's positions . An observer with the unit called in artillery and pushed back the North Korean infantry inflicting heavy casualties on the assaulting force . By 1100 , the North Korean infantry , supported by several T @-@ 34s , was pressing on A Company 's position , which was undermanned . At 1125 the requested airstrike came in ; American aircraft rocketed the T @-@ 34s to no effect while strafing the Korean forces attacking A Company . The aircraft were able to push back the attack for several minutes before running out of ammunition and being forced to leave . The North Korean troops immediately resumed their assault . 
