From March of the second year of Qing Shunzhi (1645) to November of the third year (1646), during the Qing unification war, the Qing army attacked and destroyed the Daxi regime in Zhang.

In November of the first year (1644), Zhang, the leader of the peasant army, proclaimed himself emperor in Chengdu, with the title Daxi. At that time, the main force of the Qing army was fighting Dashun Army in Li Zicheng, Shandong and Shaanxi. Later, he entered the southeast and fought the Hong Guang regime in Nanming, so he didn't have time to look west. The army of the Western Expedition was in Sichuan, mainly fighting against the remnants of the Ming Dynasty and officials and gentry. In November of the following year, the Qing court took the ambassador to Ann as General Dingxi. The Qing court invaded Sichuan with Gushan, Zhenbayan and Li Guohan to suppress the army of the Western Expedition. In the first month of three years, the Qing court sent General Jingyuan Su to Sichuan. In this way, the army of the Western Expedition faced the attack of both the Ming army and the main force of the Qing army, and the situation was grim. So in March, Fan Yizheng, governor of Mingchuan Mountain, and Wang Shangshu of Sichuan Ministry of War joined forces with Luzhou (now Sichuan) to attack Xiliang Army. So General Amin Yang Zhan also attacked the Western Front, captured Jiading (now Leshan, Sichuan) and occupied counties in southern Sichuan. More than ten people of the Great Western Army tried to enter Hubei along the Yangtze River and were stopped. They were defeated by Yang Zhan in Pengshan (now Meishan North, Sichuan) and returned to Chengdu. On the fifth day of May, Haug led his troops from Xi 'an to Hanzhong. /kloc-on 0/8, Ni Kan, the general of the Qing army, arrived at the head of the dog and defeated the Xiliang army. And arrived in Hanzhong, defeated He Zhenying, the army of the western regions. On the 25th, Hogg sent Ao Bai and Malaxi to pursue the Western Region Commanders Hezhe, Sun Shoufa and Liu Tichun in Hanzhong and Xixiang (now Shaanxi). At this time, Ming company commanders Ceng Ying and Wang Xiang stationed in Chengdu. Under the double attack of the Qing army, the Ming army and the squire armed forces, the Daxi Army abandoned Chengdu in July and retreated to Shaanxi to "sneak into the enemy's rear". In November, Haug led the troops to nanbu county, Sichuan, and Liu Jinzhong, commander of Baoning (now Langzhong, Sichuan), surrendered. At that time, there were hundreds of thousands of troops stationed in Xichong County. Haug took General Liu Jinzhong as the guide and Ao Bai, the commander of the guard army, as the pioneer, and made an all-out attack on the western army at night. In the early morning of the 27th, the Qing army arrived in Xichong. When the fog was empty, the guards of the Great Western Army returned, and there was the sound of real armor on the back camp road. Zhang said that he boosted the morale of the army and set up several guards. Soon, the Qing army arrived, and Zhang hurried out of the camp to join the Phoenix Mountain. The Qing army has reached the gate of the camp, only separated by a stream. Zhang drew a bow, but was shot by Jia Yalan, the general of the Qing army, and was killed. The western army suddenly collapsed. The Qing army pursued and broke more than 130 battalion. The demise of the western regime. Sun Kewang, Li Dingguo and so on. I collected the rest, went south from Shunqing (now Nanchong, Sichuan), and then persisted in resisting Qing Dynasty in Sichuan, Yunnan and Guizhou for more than ten years.