Tian Rong once had bad blood with Xiang Liang and didn't attack Qin Jun with Xiang Yu, so Xiang Yu didn't give him any packet.
Xiang Yu changed the original King of Qi to King of Jiaodong and made Tian King of Qi.
Tian Rong was very angry and refused to let Qi Wang go to Jiaodong. The city was afraid of Xiang Yu and secretly fled to Jiaodong. Tian Rong found him, chased him all the way, and killed him in Jimo. Tian Rong blocked Tian Du again and refused to let him enter Qi State, so Tian Du had to return to Chu State. Tian Rong killed the king of Jibei again, and then United Jiaodong, Tiqi and Jibei to become the king.
Xiang Yu was very angry when he heard that Tian Rong had rebelled. He personally led the army to clean up Tian Rong.
Tian Rong lost to Xiang Yu and fled to the plain. People in the plains killed Tian Rong.
Xiang Yu is a genius in military affairs and an idiot in politics.
The unfair enfeoffment of vassals caused people's dissatisfaction and resistance, which was one of them.
Secondly, Xiang Yu honored Chu Huaiwang as the righteous emperor, moved him to Chen County, Changsha, and secretly sent Qing Bu to intercept the righteous emperor in the river. If Xiang Yu keeps the righteous emperor, he can hold the son of heaven as a vassal. Unfortunately, the idea he believes in is "those who follow me will prosper, and those who oppose me will die." When the princes found out, they were all unfaithful to Xiang Yu.
Third, the plain people killed Tian Rong, indicating that they followed Xiang Yu. Xiang Yu not only did not comfort them, but also set fire to their houses and plundered the elderly, women and children. Everywhere I went, I was basically razed to the ground. So the Qi people United against Xiang Yu. Tian Rong's younger brother Tian Heng called tens of thousands of people to rebel against the Chu army in Yangcheng. Xiang Yu failed to attack several times and had to stay in Yangcheng.
Liu Bang took advantage of Xiang Yu's troops to Qi, assembled 560,000 vassal soldiers from five countries, and attacked Cheng Peng, Xiang Yu's lair.