In the battle of Lantian, Chu Huaiwang almost destroyed the State of Qin. Why did he still lose?

Because at that time, Chu chose to put all your eggs in one basket and assembled all the troops in the country to attack Qin. Although Qin was almost destroyed, it also caused heavy losses to our own side. South Korea and Wei, allies of Qin State, took the opportunity to attack Chu State, which led to its defeat. At that time, the reinforcements of the State of Chu, Qi, also faced defeat, and could no longer support the State of Chu. Finally, the State of Chu was defeated.

During the battle of Lantian, the whole country's army was assembled, and it was planned to fight with the blood of Qin. In the face of the menacing Chu army, Qin was also very worried and could only fully meet the challenge of Chu. However, the Chu army was so brave that Qin had to concentrate soldiers from all over the country on the battlefield in Lantian. According to legend, in order to resist Chu, even the soldiers guarding the palace came to the battlefield to support them. Thus, Qin was almost powerless to resist.

In the face of repeated attacks by the Chu army, Qin knew that he was no match for the Chu army, so he sent letters to the allies South Korea and Wei overnight, hoping that friendly countries could send troops to help Qin. Previously, because Chu contained Qin, Chu's ally Qi took the opportunity to jointly attack Qin's ally Wei with Song. Wei was defeated by Qi and Song. Fortunately, the Korean army arrived in time to solve Wei's predicament. With the help of South Korea, Wei successfully survived the crisis. After receiving the distress letter from Qin, South Korea and Wei knew that Qi and Chu had formed an alliance to annex Qin, South Korea and Wei, so Wei and South Korea immediately sent troops to support Qin.

The state of Qin, which welcomed reinforcements, thus escaped the disaster of national ruin and death. However, the defeated State of Qin still has to pay reparations for the victorious State of Chu. After this fierce battle, although Chu won, it was also severely damaged, and because all the troops were concentrated on the battlefield, the capital of Chu did not even have a guard. At this time, South Korea and Wei, who knew that the Chu army suffered heavy losses, planned to seize the territory of Chu, so they quietly led troops to besiege Chu, which led to a great defeat of Chu.