Towards the end of the Qin Dynasty, Qin sent troops to attack the restored state of Zhao. The Zhao army was defeated and retreated to Julu (southwest of present-day Pingxiang, Hebei), which was surrounded by the Qin army. King Huai of Chu, who was embraced by Xiang Liang, Xiang Yu's uncles and nephews, and other various righteous armies, appointed Song Yi as the general and Xiang Yu as the vice general, and asked them to lead their armies to rescue the state of Zhao. However, Song Yi brought his troops to Anyang and stopped advancing, and stayed there for forty-six days. Xiang Yu was very anxious and repeatedly asked him to cross the river to the north, so that he could join forces with Zhao and defeat the Qin army in one go. Song Yi, on the other hand, hoped that Zhao and Qin armies would fight to exhaustion and then send troops to reap the benefits. So he ordered his army not to act rashly. In the meantime, Song Yi was entertaining guests and eating and drinking, while the soldiers and people were starving. Xiang Yu could not bear it any longer, so he killed Song Yi, and the generals immediately embraced Xiang Yu as their general. After that, Xiang Yu immediately sent two generals with 20,000 men to cross the river to rescue Julu. After achieving a small victory, Xiang Yu ordered his whole army to cross the river to rescue the Zhao army. After crossing the river, Xiang Yu took a series of decisive actions: he sunk all the boats, broke all the cooking pots, burnt down all the barracks, and carried only three days' dry rations as a sign of his determination to fight to the death, leaving no way for his soldiers to retreat. Xiang Yu led his army to the outskirts of Julu and immediately surrounded the Qin army. After nine days of fierce fighting, he finally won the Battle of Julu.
1. Xiang Yu's personality is the courageous type.
2. Xiang Yu was well versed in the psychology of soldiers, and when Song Yi did so, Xiang Yu knew that the soldiers would not be convinced, so he could get rid of Song Yi to gain the support of the soldiers.
3. Xiang Yu had a good understanding of the enemy's military strength at that time, and adopted the tactic of breaking down the enemy one by one.
4. Song Yi's idea was to take advantage of both sides and Xiang Yu realized that he would lose the trust of his vassals.
5. Xiang Yu's killing of Song Yi demonstrated his mentality of "who will take the world for me"
6. Xiang Yu sent 20,000 men to fight and win a small victory immediately after he gained the military power to boost his morale, and to gain a little stable foundation.
7. Immediately after achieving a small victory, the whole army attacked, in order to rapidly expand the results of the battle before the enemy army was clear about our strength.
8. Xiang Yu's pre-war mobilization and action stirred up the determination of his soldiers to fight against the enemy. After crossing the river, in order to further boost the morale, Xiang Yu adopted the strategy of "putting the enemy to death before he can survive", which was a great risk, and if he did not succeed, he would collapse, and Xiang Yu's pre-war mobilization stabilized the army's morale to a great extent.
9, fight the tiger is not dead, but was injured by the tiger, only a drum to eliminate all the enemies, in order to maximize the blow to the enemy, to revitalize their own momentum, rather than just routed on the line.