 During that time , the U.S. 34th Infantry Regiment set up a line between the villages of Pyongtaek and Ansong , 10 miles ( 16 km ) south of Osan , to fight the next delaying action against the advancing North Korean forces . The 34th Infantry Regiment was similarly unprepared for a fight ; in the ensuing action , most of the regiment withdrew to Chonan without engaging the enemy . The 1st Battalion , left alone against the North Koreans resisted their advance in the brief and disastrous Battle of Pyongtaek . The 34th Infantry was unable to stop North Korean armor . After a 30 @-@ minute fight , the 34th mounted a disorganized retreat in which many soldiers abandoned equipment and retreated without resisting the North Korean forces . The Pyongtaek — Ansong line was unable to delay the North Korean force significantly or inflict heavy casualties on them . 
