Liu Zhang was the youngest of Liu Yan's four sons and inherited his father's position as the governor of Yi Province. However, his reign was full of controversy and challenges.

On one hand, Liu Zhang's personality made him prone to suspicion and fear. On the other hand, his animosity towards Zhang Lu caused many problems. Zhang Lu did not obey Liu Zhang's orders and instead became a local warlord. Liu Zhang sent troops to attack Zhang Lu several times, but all failed. As the power of Hanzhong grew stronger, Liu Zhang's reign became even more difficult.

In the 16th year of Jian'an, Cao Cao attacked Hanzhong and conquered Zhang Lu. Liu Zhang felt terrified. At this time, Zhang Song persuaded Liu Zhang to ally with Liu Bei and let Liu Bei lead troops into Sichuan to resist Cao Cao. Although Huang Quan and others opposed it, Liu Zhang still sent Fa Zheng and Meng Da to welcome Liu Bei into Sichuan.

After Liu Bei entered Sichuan, Liu Zhang led 30,000 troops to personally greet Liu Bei and meet him in Fucheng, where they drank and celebrated for several days. However, Liu Bei did not forget his ambition. Zhang Song and Fa Zheng persuaded Liu Bei to seize Yi Province while the opportunity arose. Although Liu Bei felt reluctant, he ultimately pretended to want to leave Yi Province.

Zhang Song wrote a secret letter to Liu Bei, urging him to seize Yi Province by force and promising to act as an insider. However, this plan was reported by his brother Zhang Su, and the entire Zhang family was killed.

Liu Bei was furious and attacked Liu Zhang. In Luocheng, military strategist Pang Tong was killed by Liu Zhang's general Zhang Ren. Liu Bei urgently summoned Zhu Geliang, Zhang Fei, Zhao Yun, and others to lead troops into Sichuan.

At this time, Ma Chao fled to Hanzhong after being defeated by Cao Cao and became affiliated with Zhang Lu, but was suspected by him. Zhang Lu had originally planned to marry his daughter to Ma Chao, but his subordinates said that Ma Chao did not even love his own family, so wouldn't marrying his daughter to Ma Chao be pushing her into a pit of fire? Zhang Lu found this reasoning very convincing and gave up the idea of marrying his daughter to Ma Chao.

Enraged by this, Ma Chao decided to leave Zhang Lu and ally with Liu Bei. After leading his troops to join Liu Bei, Ma Chao became one of Liu Bei's generals. Under Liu Bei's leadership, he fought many battles against Zhang Lu and others. Together with other generals, Ma Chao helped Liu Bei seize Yi Province, defeat Liu Zhang, and become the founding emperor of the Shu Han dynasty.

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