The 79th Division was ordered to attack Yudam-ni from the north. East of the Chosin, the 80th Division, with one regiment of the 81st attached, would attack and destroy the army forces there. By November 29, they realized the offensive was not going well. The forces at Yudam-ni had failed to break into the perimeter. That evening they changed the plan and shifted the principal effort to the 31st RCT east of the reservoir. They committed the two additional regiments of the 81st Division to the attack, with, possibly an additional regiment of the 94th Division.