 The U.S. 21st Infantry Regiment suffered 228 killed , 61 wounded , 215 captured , and 27 missing in the battle ; a total of 531 casualties . Of those , 130 of the captured and 20 of the missing died . Additionally , 23 other American units engaged in the region suffered 31 killed , 79 wounded , 15 captured and 9 missing ; in total a further 134 casualties . This brought the total number of casualties for the three @-@ day period to 665 and made Chochiwon the bloodiest battle for American forces yet in the conflict ; greater than the casualty counts at Osan , Pyongtaek and Chonan combined . The loss of materiel was also great with the 21st Infantry Regiment losing enough equipment and materiel to outfit two rifle battalions , and enough clothing to equip 975 men . Against these losses North Korean casualties could not be estimated due to a lack of communication among fighting units , which limited the value of American signals intelligence . 
