384年,高盖初为西燕开国之君慕容泓谋臣。他认为慕容泓的道德威望不如慕容冲,且执法苛峻,于是就杀掉了慕容泓,立慕容冲为皇太弟(实际的君主,以在前秦的慕容𬀩为皇帝)。慕容冲任命高盖为尚书令。领兵在长安与苻坚攻战,屡败。慕容冲派高盖夜袭长安,进入了南城,前秦左将军窦冲、前禁将军李辩等将其打败,斩首八百多人,士兵们把尸体分开吃掉。高盖领军攻打渭北营垒,太子苻宏在成贰壁击败高盖,斩首三万人。385年十月,慕容冲派高盖率众五万讨伐后秦,在新平以南交战,高盖大败,投降了后秦。高盖把杨定作为儿子,等到高盖失败,杨定逃奔到陇右,收集过去的兵众。
参考资料
- 《资治通鉴》卷106
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