It became evident that more preparation, by Marine air and artillery, would be required for the recapture of Siberia. At 0650, four Marine F9F jet fighters worked the hill over with napalm and 500-pound bombs. Three hours later, a flight of Air Force F-80 “Shooting Star” jets dropped eight 1,000-pound bombs on the same target. With the aerial attack complete, Marine artillery opened fire. Five minutes later another Marine reinforced platoon launched a second ground attack. This was made by a unit from Company A (Captain Robert W. Judson) of the regimental reserve battalion, supported by a Company E platoon. Again the Marines advanced to the open sector south of the hill before the enemy reacted. As before, the Chinese response was a devastating barrage from their supporting weapons. The stubborn Marine assault against Siberia brought down the full weight of Chinese firepower--rifle, machine gun, and hand grenades--but the attack force would not be beaten off. At 1103 the Siberia hill again belonged to the Marines. Quickly the Company A platoon began to organize a defense to repulse the Chinese counterattack, which was certain to come. In anticipation of a prompt and violent retaliation by the Chinese, and to help the speedily improvised defense efforts, the 2/1 battalion commander, Lieutenant Colonel Batterton, had sent forward the supporting platoon from Company E. This reinforcing unit reached Siberia within seven minutes after the Marine attackers had gained possession of the objective. The new arrivals scarcely had time to dig in before a hail of mortar and artillery shells forced all the Marines to seek cover in a defiladed position on the southern side of the slope. From here, the 2/1 force directed counter mortar and artillery fire onto the top and far side of Siberia and unleashed their own assault weapons against the Chinese soldiers pressing for possession of Siberia. By midafternoon, with heavy enemy counterfire on the position and their casualties reaching nearly 75 percent, the Marines were forced to withdraw and return to their own lines. The hill had changed hands twice and the enemy had employed 5,000 rounds of artillery in the contested ownership.