When Chu and Han contended, Liu Bang ordered his general Han Xin to lead troops to attack Zhao. Wang Zhao took 200,000 troops to meet the enemy in Jingxingguan, Taihang Mountain. At that time, Han Xin only brought twelve thousand troops. In order to defeat Zhao Jun, he stationed 10,000 people by the river and formed a backwater array. In addition, 2,000 Qingqi were sent to lurk around Zhao's military camp. After the war, Zhao Ying's 200,000 troops killed 10,000 Han troops by the river. In the face of the enemy, the Han army had no way to escape, but had to fight to the death. At this time, two thousand soldiers lurked in and attacked Zhao Ying. Zhao was attacked from front to back and was quickly defeated by Han Xin. After the war, someone asked Han Xin, "There is water behind the taboo of military strategists. Why did the general knowingly commit a crime? " Han Xin said with a smile: "After death, it is also recorded in Sun Tzu's Art of War."