When word of the disaster that had overtaken 1st Battalion reached regimental headquarters , Freeman obtained the release of G and F Companies from 2nd Division reserve and sent the former to help 1st Battalion and the latter on the southern road toward Pugong @-@ ni and C Company . Major Lloyd K. Jenson , executive officer of the 2nd Battalion , accompanied F Company down the Pugong @-@ ni road . This force was unable to reach C Company , but Jenson collected stragglers from it and seized high ground astride this main approach to Changnyong near Ponch 'o @-@ ri above Lake Sanorho , and went into a defensive position there . The US 2nd Division released E Company to the regiment and the next day it joined F Company to build up what became the main defensive position of the 23d Regiment in front of Changnyong . North Korean troops during the night passed around the right flank of 1st Battalion 's northern blocking position and reached the road three miles behind him near the division artillery positions . The 23rd Infantry Headquarters and Service Companies and other miscellaneous regimental units finally stopped this penetration near the regimental command post 5 miles ( 8 @.@ 0 km ) northwest of Changnyong .