416年六月，并州幾萬帳落胡人背叛後秦，到平陽推舉匈奴人曹弘為大單于，在匈奴堡攻伐後秦立義將軍姚成都。征東將軍姚懿從蒲坂率兵討伐，擒獲曹弘，將他押送到長安，並把這些胡人中一萬五千落帳的豪族遷往雍州。
參考資料
- 《資治通鑑》晉紀·義熙十二年
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