 As the US Eighth Army stopped its advance on the afternoon of November 25 , 1950 , the PVA 13th Army commenced the Second Phase Campaign . A massive frontal attack was launched against the entire UN line from Yongsan @-@ dong to Yongwon . To the west , the ROK 1st Infantry Division of the US I Corps was attacked by the PVA 66th Corps at Yongsan @-@ dong . In the center , strong probing actions by the PVA 39th and 40th Corps were carried out against the US IX Corps at Ipsok and Kujang @-@ dong . In the east , the PVA 38th and 42nd Corps broke through ROK II Corps ' line at Tokchon and Yongwon . The Home @-@ by @-@ Christmas Offensive was completely stalled on the morning of November 26 . 
