Conquest of Chouchi by Former Qin
4th-century military campaign in China

The Conquest of Chouchi by Former Qin, also known as the Conquest of Chouchi by Qin, was a military campaign launched by the Former Qin dynasty against the polity of Chouchi in March or May 371 during the Sixteen Kingdoms period of China. The campaign concluded in the fall of Chouchi, discontinuing the state for fifteen years before its restoration in 385.
Background
Chouchi was a minor Di polity that encompassed parts of modern-day Longnan, Gansu. Despite its small size, the mountainous terrain and their willingness to submit as a vassal prevented them from being subjugated by their larger, more powerful neighbours. However, in 370, the new ruler, Yang Cuan was immediately thrown into a civil war with his uncle, Yang Tong. Cuan had also severed ties with the Former Qin, submitting to the Eastern Jin in the south instead.
That same year, Qin conquered the Former Yan, establishing dominance over northern China in spite of the Former Liang, Dai and Chouchi. Encouraged by his success, the Heavenly King of Qin, Fu Jian, sought to unify the whole of China under his banner.
The campaign
In March or April 371, Fu Jian sent the Marquis of Xi, Fu Ya with his generals, Yang An, Wang Tong, Xu Cheng, Zhu Yong and Yao Chang to lead 70,000 soldiers in invading Chouchi. In April or May, the Qin army reached Jiuxia (鷲峽; in present-day Xihe County, Gansu), and Yang Cuan went out with 50,000 troops to resist.
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