Tian Rong, the prime minister of Qi, disobeyed Xiang Yu's order, and Xiang Yu did not give him the title of king when he sealed the princes, but made Tian Du, the Qi general who followed him into the pass, the king of Qi.

Tian Rong was resentful, united with Cheng Anjun Chen Yu, who was also disgruntled, and raised troops against Xiang Yu. Tian Rong killed Tian Du and established himself as the king of Qi.

Zhang Er, maybe everyone can still remember him, he once took in Liu Bang, a young man who defected to Xinlingjun and did not meet. He also participated in the vigorous uprising at the end of Qin and served as the prime minister of Zhao Xie, the king of Zhao. When Xiang Yu was a prince, he named Zhang Er as the king of Changshan, and renamed Zhao Xie as the acting king.

Chen Yu defeated Zhang Er with the help of Tian Rong's strength. Zhang Er went to Liu Bang in a panic, and Liu Bang took him in very warmly. Chen Yu welcomed back Zhao Xie and continued to be the king of Zhao. Returning the favor, Zhao Xie named Chen Yu as the acting king. Xiang Yu was furious and sent troops to attack the disobedient Tian Rong and Chen Yu.

Liu Bang decided to take the opportunity to attack Guanzhong. Han Xin offered a plan and sent Fan Hao to lead 10,000 soldiers to work overtime to repair the plank road that was burned when he came to Hanzhong, which was a big project and would take at least three years to complete. Liu Bang ordered, "It must be completed within a year!" "It's deliberately loud. Yongwang Zhanghan was paralyzed by this. Liu Bang and Han Xin led the main force to attack Chen Cang by taking the path among the mountains. Left an allusion to the "Ming Xiu Plank Road" for future generations.

Chencang is located in Chencang District, Baoji City, today, and is the throat road leading to the Guanzhong Plain in southern Shaanxi. Zhang Han was caught off guard and hurriedly led his troops to aid Chen Cang. After all, Zhang Han was a famous general, and he quickly entered the state, and he was native to his hometown and familiar with the terrain, and the Han army's attack was frustrated.

Zhao Yancai, a native of Hanzhong, followed Liu Bang for a short time, and he became familiar with the local situation and suggested that the Han army take another route to cross Weishui. Zhang Han was caught off guard again, and fled to the waste hill and Haozhi (east of Qianxian County, Shaanxi). The Han army occupied Chencang, and the door to the hinterland of Guanzhong was opened. The history books left the story of "secretly crossing Chen Cang".

The Han army pursued to Haozhi and captured Zhang Han's younger brother Zhang Ping. Zhang Han led the remnants to stick to the ruined hills of the capital of King Yong, and the Han army could not attack it for a long time.

At the same time, Liu Bang ordered Guan Ying and other generals to attack Liyang and other places, and Sima Xin, the king of Sai, and Dong Peng, the king of Zhai, surrendered successively. Shenyang, the king of Henan, also surrendered.

Zheng Chang, the king of Han, was originally the commander of Wu County in the Qin Dynasty, followed the Xiang family to raise troops, and had a good relationship with Xiang Yu. Xiang Yu abolished and killed Han Cheng, the king of Han, and made Zheng Chang the king of Han. Zheng Chang refused to join Liu Bang and was defeated by Han Xin's troops.

After Han Cheng was killed, Zhang Liang fled back to Liu Bang and became Liu Bang's most relied on advisor. Liu Bangfeng Han Xin, the captain of South Korea, is the king of Han, and the two Han Xin have the same name.

The entire Guanzhong and the adjacent areas outside the Guanzhong were subdued by Liu Bang, leaving only a lonely city and a ruined hill. Subsequently, Liu Bang marched east to Pengcheng, leaving Han Xin to attack the waste hill.

In June 205 BC, the Han army had been besieging the ruined hill for ten months. It was early summer, and the rain was pouring down. Han Xin stood on the hillside and had a plan: flood the ruined hill city.

With the help of the rain, the Han army accumulated sandbags in the upper reaches of the Baishui River outside the ruined hill city, and the water was as high as ten zhang.

Subsequently, Han Xin ordered the Han army in the area of the waste hill to collectively go up the mountain and bring down the embankment. The rolling flood instantly washed down the ruin mound city wall, and the defenders in the city were in chaos.

The Han army occupied the waste hill, and the three Qin were pacified.