[1] In 303, the Chief Controller of You province, Wang Jun sought to protect himself in light of the Jin civil wars by allying with the surrounding Xianbei and Wuhuan tribes.
Wang Jun formed an alliance with the Duan by marrying his daughter to Wuwuchen, and since then, the two sides began working closely with one another.
The Xianbei cavalry played an important role in securing Sima Yue's victory, but they also participated in the sack of Chang'an which killed more than 20,000 people.
[4] In 307, after Emperor Huai of Jin's ascension, Wang Jun, now Inspector of You province, petitioned for the imperial court to grant Duan Wuwuchen the title of Duke of Liaoxi.
They fought at Mount Feilong (飛龍山) and won a great victory over Shi Le, reportedly killing more than 10,000 of his soldiers and forcing him to retreat to Liyang (黎陽縣; present-day Xun County, Henan).