By 1 December, the PVA 58th Division was virtually destroyed, with the remainder waiting for reinforcements from the 26th Corps of the 9th Army. Much to the frustration of Song Shilun, the 26th Corps did not arrive before the Marines broke out of Yudam-ni. The airfield was opened to traffic on 1 December, allowing UN forces to bring in reinforcements and to evacuate the dead and wounded. With the Marines at Yudam-ni completing their withdrawal on 4 December, the trapped UN forces could finally start their breakout towards the port of Hungnam.