War comes to Korea: the first six months -- Retreat to Wonju : Second Infantry Division, 1- 6 January 1951 -- Action at Wonju : Twenty-Third and 38th Infantry Regiments, 6-7 January 1951 -- Return to Wonju : Second Infantry Division, 8-20 January 1951 -- Hill 312 : First Battalion, 5th Cavalry Regiment, 28-30 January 1951 -- Twin tunnels : Third Battalion, 23d Infantry Regiment, and French Battalion, 30 January 2 - February 1951 -- Operation Roundup : supporting the ROK troops -- Operation Roundup : escaping the trap -- Holding the Chinese : Chipyong-ni and Wonju -- Relief of Chipyong-ni : Task Force Crombez.