余岩在后燕担任建节将军。385年七月,余岩反叛后燕,率领四千余人从武邑北上幽州。燕王慕容垂命守幽州的平规固守勿战,结果平规规出战,为余岩所败。余岩入蓟城,掠夺千余户而去,于是据守令支。八月,慕容垂派骠骑大将军慕容农出蠮螉塞,经过凡城至龙城,合兵讨伐余岩。
十一月,慕容农至龙城,马骑士兵休息十余日。诸将问为何久留不进,慕容农以余岩的军队是乌合之众,非有纲纪,久将离散,等收粮之后再行出战。随后率步骑三万攻打令支。余岩军惊恐,很多人相次逾城归降慕容农。余岩计穷出降,慕容农将他斩杀。
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