tank thrust coupled with the general forward movement of the rest of the 2nd Division found the PVA still in the open en route to their new positions. Woods's tankers raced to the town of Mundung-ni and beyond, taking losses on the way, but inflicting heavy losses upon the PVA troops and cutting off the supply and replacement routes up the western slopes of Heartbreak Ridge. At intervals of about the tanks, operating without infantry in the northern reaches of the valley, were able to cover each other and fire at targets of opportunity. They disrupted the PVA relief completely and made the task of the infantry much lighter in the days that followed. It was apparent that the KPA/PVA had thought that tanks could not be used in Mundung-ni Valley and the feat of Love's engineers in opening a road had taken them by surprise. The battle, however, was not quite over. The 3rd Battalion, 38th Infantry, took advantage of the tank advance to seize Hill 605, but the 2nd Battalion's attempts to capture Hill 905 were blunted on 10 October. The next day the 2nd Battalion overcame PVA/KPA opposition and the 1st Battalion took Hill 900. On 12 October the 1st Battalion pushed on toward the Kim Il Sung range and captured Hill 974. The final objective of the 38th, Hill 1220, fell on 15 October. On Heartbreak Ridge the KPA 23rd Regiment, 13th Division, defended Hill 851, backed by its sister regiments, the 21st and 19th. The 21st was to the immediate rear and the 19th defended the Sat'ae-ri Valley. On 10 October, Colonel Daniels' 2nd Battalion had swung down from Heartbreak Ridge and taken possession of Hill 520, a little over south of the town of Mundung-ni. Hill 520 was the end of an east-west ridge spur leading to Hill 851. During the next two days, the 1st and French Battalions inched north toward the objective, bunker by bunker, taking few prisoners in the bitter fighting. The KPA/PVA on Hill 951 had to be killed or wounded before they would cease resistance. Colonel Craven's 3rd Battalion shifted to the spur between Hills 520 and 851 to apply pressure from the west. Finally at daybreak on 13 October, Monclar's French troops stormed the peak and after thirty days of hard combat, Heartbreak Ridge was in the possession of the 23rd Infantry. Aftermath The costs of the long