The Battle of Shangganling, which shocked China and foreign countries, lasted for 43 days, and the United Nations army led by the United States launched a crazy war against the Korean region. Shangganling is the last high ground of this war, and it is also the key battle that determines victory or defeat. At first, the US army was bound to win this battle, but what it did not expect was that this place would become the biggest fiasco of the US army. In this battle, the US army sacrificed nearly 30,000 soldiers, but even with such large casualties, the US army still did not advance further on the Shangganling front. In desperation, it can only end in failure.

After the Battle of Shangganling, the U.S. army was also cast out of the psychological shadow. The US military calls Shangganling simply their "sadness ridge." Many years have passed since the Battle of Shangganling, but the US military has not been able to figure out to this day why the US military invested so many troops and was well-armed, but it failed to take the high ground of Shangganling. In the end, stealing chickens and not corrupting rice, not only paying a huge price in casualties, but also letting themselves be defeated, in addition to making the us military's international status plummet, because the myth of undefeated was completely broken.
It was not until our country told the real reason that the United States suddenly realized. Because at that time, the volunteer army adopted a tactic that was unheard of by the US military, that is, tunnel warfare. Our army dug a large number of tunnels and turned the US army around. At that time, the US military bombed China's Shangganling position day and night. In terms of the intensity of firepower, the volunteer army had no advantage in front of the Us army at that time. Frontal confrontation did not do any good for the volunteers, so our army adopted the tactic of avoiding its sharp edge and luring the enemy deeper.
Use the tunnel to avoid the attack of The American artillery, and then let the American troops mistakenly believe that they have been killed by the bombing and rush up the mountain. But in fact, the volunteer army had long been ambushed around and annihilated the American troops who rushed to the heights in one fell swoop. What the U.S. military could not believe most was that in the Battle of Shangganling, the volunteers dug more than 1,200 kilometers of tunnels with their bare hands. The US military will never learn this kind of will, and the US military finally knows why it will fail and cannot win the volunteer army.