By 21 : 00 , the closest front line unit was B Company on top of Hill 209 , 1 mile ( 1 @.@ 6 km ) north of the river road which curved around the hill 's southern base . The regimental chaplain , Captain Lewis B. Sheen , had gone forward in the afternoon to B Company to hold services . On top of Hill 209 , Chaplain Sheen and men in B Company after dark heard splashing in the water below them . They soon discovered a long line of North Korean soldiers wading the river .