413年七月，河西胡曹龙等率领部众二万多人前来攻打北魏的蒲子，西河胡人张外投降曹龙，推举曹龙为大单于。八月，曹龙请求投降北魏，并把张外抓住，送往北魏。北魏拓跋嗣杀掉张外。
参考资料
- 《资治通鉴》晋纪·义熙九年
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