1、 Time of day
At the end of the Qin Dynasty, the princes all over the world rebelled against Qin. Xiang Yu conquered Xianyang and destroyed the state of Qin. Although the Qin Empire collapsed, Xiang Yu did not rebuild a new dynasty. He restored the enfeoffment system of the Warring States.
Xiang Yu enfeoffed the princes. In terms of the national situation, the political power is still not unified, and all regions are under separate regimes. Although the Western Chu overlord occupied the hinterland of the Central Plains, he enfeoffed the 18 princes and separately controlled all parts of the original Qin state.
Liu Bang was the first to attack Guanzhong and Xianyang. Xiang Yu was suspicious of him, and even killed him in Bashang. Xiang Yu made Liu Bang the king of Hanzhong, far away from the Central Plains, and had the natural danger of Shu Road, hoping to trap Liu Bang to death in Hanzhong.
Tianshi was very disadvantageous to Xiang Yu. The violent Qin Dynasty was destroyed, and the regime was torn apart. Liu Bang was granted a remote position, so he was able to recuperate, recruit troops, and accumulate grain.
2、 Good location
Xiang Yu made Liu Bang the queen of Hanzhong, but he still had a heart for Liu Bang. He made Zhang Han, Sima Xin and Dong Yi the three demoted generals of Qin, and divided Guanzhong area into three parts. He made them kings to prevent Liu Bangdong from going out of Guanzhong.
According to Xiang Yu's plan, Liu Bang could be sealed up in Hanzhong and prevented from going out by the three kings. All things were well done. However, Xiang Yu did not expect that this kind of safe arrangement was the best cover for Liu Bang. Liu Bang just took advantage of Hanzhong's remote geographical advantages to launch a sneak attack, and quickly defeated Zhang Han, Sima Xin, Dong Yi and others, and occupied Guanzhong area.
Concerning the central region, Liu Bang greatly enriched the military resources and logistics supply, and took Guanzhong as the base to launch the Chu Han war against Xiang Yu.
3、 People and
Human is the most important factor in the war, and the change of human resources ultimately determines the outcome of the battle between Chu and Han. After the overthrow of the Qin Dynasty, Xiang Yu enfeoffed the capable generals and made them become kings. There were not many generals who could fight for Xiang Yu. In addition to Longqi, zhonglimai and others, Dong Yi, Zhanghan, yingbu, Pengyue and zangda were enfeoffed as kings by Xiang Yu. This was to let them stand on their own. In the end, these people were either easily destroyed by Liu Bang or defeated by others He took refuge in Liu Bang and became Xiang Yu's most difficult opponent.
In Liu Bang camp, the Han army with Peixian old man as the team was firmly controlled by Liu Bang and served Liu Bang faithfully. In terms of talent allocation, the talent structure of the three heroes in the early Han Dynasty was unmatched by Xiang Yu camp.
Especially in terms of military talents, Liu Bang's generals are far stronger than Xiang Yu's camp. The reason is that Xiang Yu is too brave and arrogant to accommodate more capable people.
To sum up, the battle between Liu Bang and Xiang Yu between Chu and Han lasted only four years, which had little to do with military affairs, or the advantages of the two camps were different.
