After the victory of the first 597.9 highland counterattack, the company and platoon cadres, party members, and combat backbones of the reinforced company held a battle summary and analysis meeting. At the meeting, military democracy was brought into full play, and everyone spoke enthusiastically and fully discussed the problems existing in the battle, the advantages that need to be carried forward, and the tactical arrangements for the next step. After nearly two hours of meetings, the following consensus was finally reached: 1. Invest less strength in the position during the day, continue to adopt the tactics of the ninth company putting in 3-5 people at a time and adding them one by one, and be mentally prepared for the enemy's possible change of tactics. 2. Strengthen reconnaissance in the event that the enemy may once again use tanks as an assault force, call for artillery support at any time, try to save the use of special ammunition for bazookas, and pay attention to saving ammunition. 3. It is necessary to be prepared for the interruption of artillery support by our army due to the reserve of artillery shells, and at the same time continue to carry out the tactics of striking at the enemy's high-value targets by Zhang Dongfang. 4. It is highly likely that the enemy's fire will be more intense, and the attack will be more frenzied; We must prepare for the worst, and strive to hold out until dark and then retreat to the tunnel; At the same time, be prepared to hold out until it gets dark. 5. When the main forces in the rear organize a counterattack again at night, the troops retreating into the tunnels, no matter how great the difficulties they face, they must do their best to cooperate with the counterattacking troops to restore the lost positions. 5. Comrade Zhang Lan must take care of the wounded in the tunnel, and all comrades must be mentally prepared for the possibility of all sacrifices in the end.

At 5 o'clock in the morning of 15 October, the US troops again concentrated 300 large-caliber artillery pieces to bombard the 597.9 and 537.7 heights of Shangganling and Beishan on the 537.7 heights more fiercely than on the 14th. When the U.S. artillery fire began to extend, some troops were just about to go out to meet the enemy, "Wait a minute, I feel that something is wrong, everyone wait for another 20 minutes." Zhao Lianfa immediately stopped the troops who were preparing to get out of the tunnel. Fifteen minutes later, eight B-26 bombers of the US military flew over the 597.9 height, and dozens of heavy bombs and special special bombs poured down; the huge explosion sound and the huge explosive power of the bombs were enough to overturn the 597.9 high ground, and dozens of special special bombs turned the bomb-blown position into a sea of fire in an instant......

"The enemy infantry is coming up, ready to fight! Disperse after arriving at the position and be ready to hide from the enemy's shelling and bombardment at any time. After the roar of the enemy's bombers flying away, Zhao Lianfa gave the troops a combat order. In accordance with the tactics formulated before the war, the volunteer troops resisted the tidal wave of attacks of the US troops in different positions, and Zhang Dongfang continued to give full play to his expertise to strike at high-value targets such as the front-line command and command personnel of the US army. This time, the U.S. Army did not use a large number of tanks to cover the infantry charge as on the 14th, but used tank guns for fire support at a distance of 500 meters from the position of the Volunteers. It seems that the instructor repeatedly told him to pay attention to the changes of the enemy too prescient (it turned out that the US military was better at summarizing and changed tactics relatively quickly).

The battle soon entered a white-hot state, and every 5 minutes a soldier of the Volunteer Army rushed out of the tunnel to reinforce, and the American Army charged the Volunteer Army several times with a whole company; At the same time, the US military continued to shell various positions on the 597.9 heights, strafe aircraft fire, and drop bombs and special special bombs...... The officers and men of the Volunteer Army gave full play to their superb tactical literacy and fearless heroism to repel the enemy's crazy attacks again and again; Every inch of land in Shangganling can testify, and the 3,000 miles of rivers and mountains in North Korea can testify, and our volunteer soldiers are the most lovely people! After a day-long battle to the death, due to heavy casualties, Zhao Lianfa and Li Wenwu decided that the troops should withdraw into the tunnel in the evening to rest and recuperate, and prepare to cooperate with the follow-up reinforcements to counterattack at night. In a day-long battle on the 15th, the casualties of the US army on the 597.9 heights alone reached about 600 (360 dead), and more than half of the recruits replenished by the US army were lost. When the volunteers withdrew to the tunnel to count the number of people, there were still 20 people who could fight, and 10 people were seriously wounded (256 people in the volunteers at the beginning of the morning battle); There are only two company-level cadres left, Zhao Lianfa and Li Wenwu, and the platoon commander is only Lao Cannon and the platoon commander of the third platoon of the Seventh Company; There were still three squad leaders, and only 5 of the 36 party members were left (including Zhao Lianfa, Li Wenwu and Lao Pao), and Zhang Dongfang was slightly wounded (Zhang Dongfang killed 6 US officers and 4 flamethrowers in the day's fighting...... In a daytime battle on the 15th, the volunteers on the 597.9 heights repelled a total of 32 attacks by the US army, dealing a heavy blow to the arrogance of the US army.

In the battle during the day on the 15th, countless people's heroes emerged, and in the defensive battle of the No. 2 position, Zhao Weiguo, a member of the 7th Company of the 136th Regiment, accurately threw grenades into the enemy group more than a dozen times in the battle, causing heavy casualties to the US troops; He dodged enemy shelling several times, and when American fighters strafed at low altitudes (two comrades died in the enemy's low-altitude strafing), he raised his machine gun and shot down an enemy plane. In the process of firing with enemy planes, Zhao Weiguo was wounded in many places, especially in the leg, and the enemy took the opportunity to rush to the No. 2 position; Zhao Weiguo, who was seriously wounded, grabbed a blaster and died with the enemy who rushed up! Li Junhao, the platoon commander of the second platoon of the 8th Company of the 136th Regiment, constantly changed positions to shoot and drop bombs for nearly an hour when he was the only one left in the No. 5 position, killing and wounding more than 80 enemies; When the enemy's two flamethrowers rushed to the position, Li Junhao, who had run out of ammunition, killed one with a bayonet, and at the moment when the other American flamethrower drowned him in the sea of fire, he used his last sobriety and strength to hug the enemy...... Lao Cannon and Zhang Dongfang also faced the situation of the enemy rushing to the main peak position many times in the battle, and the two fought together many times the enemy several times their own hand-to-hand combat; Several times repelled enemy attacks, and when they returned to the tunnel, they were almost covered in blood; When Zhang Lan examined them, she was surprised to find that the two had only suffered minor injuries. "The platoon commander and I arrived at Marx's door and were stopped by Marx, who said that we had not killed enough enemies, and the predecessors of the Taiping Army and the Boxers were not satisfied; Let's go back and destroy the enemy more and serve the Motherland! We had to come back....." Zhang Dongfang teased Zhang Lan when Zhang Lan was taking medicine. "It's a pity that the company commander asked us to withdraw into the tunnel, otherwise the platoon commander and I would ...... the enemy," Zhang Dongfang had to add, but Zhang Lan interrupted, "If it weren't for the company commander and the instructor's order to withdraw, you and the platoon commander would really stay with Marx for a long time...... In addition, although the injuries of the deputy platoon commander and Comrade Zhang Dongfang were not serious, each of them suffered more than a dozen injuries, and we must pay attention to the injuries. Zhang Lan emphasized again when she was drugged for Lao Pao and Zhang Dongfang. 597.9 The daytime battle on the high ground is over, and the volunteer soldiers who retreated into the tunnel are waiting for the counterattack at night......

On the morning of 15 October, the South Korean 2nd Division, supported by 200 artillery pieces, dozens of aircraft, and dozens of tanks, launched a fierce attack on the 537.7 heights of Buksan. On October 15, during the day, the 537.7 Heights Beishan experienced almost the same or even more brutal tests as the 597.9 Heights, and after a day of bloody battles, the Volunteers temporarily abandoned the surface positions and withdrew into the tunnels like the 597.9 Heights, preparing to cooperate with the counterattack of the follow-up troops at night. In a daytime battle on 15 October, the South Korean Second Division suffered more than 700 casualties, and the Volunteer Army was reduced from 280 to about 40 people.

Beginning on October 16, the 15th Army of the Volunteer Army, according to the changes in the enemy's situation, changed the 45th Division responsible for guarding Shangganling from the original assist to the main attack, and the artillery fire at the army and division level began to move in the direction of Shangganling; The 15th Army began to concentrate on ensuring the logistical supply of the 45th Division; The 15th Army has set up a corresponding artillery command post and a rear logistics organization to actively replenish key logistics materials such as ammunition, food, medicine, and water to the tunnels. At the same time, further efforts were made to support the counterattack of the 45th Division against the enemy. During the three-day period from 15 October to 17 October, the basic mode of operations in Shangganling was that the enemy used the superiority in firepower and the number of combatants to occupy the surface positions of the 597.9 and 537.7 heights in Shangganling during the day, and our army used the support of artillery fire and the cooperation of the tunnel troops to recapture the surface positions of the 597.9 and 537.7 heights on the north hill of the 537.7 heights during the night. The defensive operations during the day and the counterattack operations at night were great tests for both the volunteers and the US army. At noon on the 16th, the 597.9 heights and the 537.7 heights Beishan lost two-thirds of their surface positions, and the volunteer reinforcements launched a counterattack in the afternoon in the face of the enemy's air raid and artillery blockade; not only did they restore their surface positions, but the defending troops called for artillery support at Shangganling for the first time, and for the first time they knocked out the enemy tanks that were providing fire support about 500 meters away from the positions. The Katyusha rocket artillery battalion of the Chinese Volunteers also carried out extended firing in the counterattack and positional defense battle on the afternoon of the 16th, and once suppressed the artillery fire of the US army (this was the first large-scale artillery bombardment of the US army for a long time in the War to Resist US Aggression and Aid Korea). In these tug-of-war battles, the U.S. military paid far more than it expected, and it did not stably occupy the two palm-sized heights of Shangganling (after the war, we knew that the U.S. military planned to occupy Shangganling completely and stably in 5-6 days, and paid about 200 casualties to achieve its occupation goal, and the U.S. military called this offensive a "showdown operation"; In fact, the casualties of the U.S. military reached more than 600 on the first day); The U.S. Eighth Army's military headquarters and subordinate intelligence services have always wondered one thing: "How did the Chinese army survive under super-saturated artillery and aviation fire?" After each super-firepower strike during the day, the Chinese army had enough strength to hold the position; And most of the time it can hold out for a day, what kind of methods did the Chinese army use? The U.S. military was puzzled.....