 At noon on October 30, the 15th Corps bombarded the Koreans with 133 large-caliber guns, 22 rocket launchers and 30 120 mm heavy mortars in the largest Chinese artillery operation of the Korean War. When the bombardment ended at midnight, 10 infantry companies from the 45th and the 29th Divisions swarmed over the ROK 31st Regiment's positions and pushed the South Koreans off the summit. In the aftermath of the fighting, only 175 South Koreans survived the onslaught out of the three defending infantry companies. With the PVA 91st Regiment of the 31st Division, 12th Corps, arriving as reinforcement on November 1, the Chinese forces chased the remaining South Korean defenders off Jane Russell Hill and beat off the subsequent counterattack. Responding to the losses, the US IX Corps ordered the ROK 30th Regiment of the ROK 9th Infantry Division to take back Triangle Hill on October 31. The South Koreans launched continuous attacks for the next five days to no avail. Although the South Koreans failed to recapture the hill, the resulting heavy casualties forced the Chinese to call in the 93rd Regiment of the 31st Division as reinforcement on November 5. On the same day, Lieutenant General Reuben E. Jenkins, commander of the US IX Corps, suspended further attacks on Triangle Hill to prevent more casualties and to protect Sniper Ridge.
