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关于逸豆归如何成为宇文部首领,史籍有二种不同说法。《资治通鉴》记载:333年,当时身为宇文部东部首领的逸豆归驱逐了其主宇文乞得龟而自立,慕容部鲜卑首领慕容皝出兵声讨,逸豆归惧而请和;而《魏书》则称“逸豆归杀乞得龟而自立”。
慕容皝庶兄慕容翰曾逃奔宇文部,但后来为逸豆归所忌,遂返慕容部,他对逸豆归的评语是:“篡窃得国,群情不附。”、“性识庸暗”,并称当时的宇文部“将帅非才,国无防卫,军无部伍。”
343年,逸豆归遣其相莫浅浑率兵攻前燕(慕容部是其前身),莫浅浑因轻敌而大败,仅仅逃出一命,士卒皆为燕军所俘。前燕在次年(344年)出兵攻逸豆归,攻下了宇文部的都城,逸豆归逃往漠北,后来死于该地,宇文部也因此散亡,由于逸豆归在位时依附后赵,前燕攻宇文部时,后赵天王石虎曾出兵相救,但赵军到达前宇文部已灭亡。
不过,《魏书》的记载却称该战役系发生于345年,结果逸豆远遁漠北,后来逃往高丽。慕容皝将其部众五千余落迁至昌黎(今中国辽宁省朝阳市),宇文部自此散灭。
另外,《周书》则将逸豆归之名记载为侯豆归,并称其子宇文陵曾仕于燕国(前燕或后燕),还曾拜驸马都尉,被封为玄菟公,后又降于北魏,其后代即存于魏。而后来的西魏太师、北周的实际建立者宇文泰即为逸豆归的五世孙。
343, Mok Yat beans go Qianqi phase before the shallow muddy rate Bing Gong Yan (Murong Department is its predecessor), Mo shallow muddy due to underestimate the enemy and defeat, only to escape a life, his soldiers are all YAN Jun by the prisoner. Former Yan in the following year (344 years) go out of Bing Gong Yi beans, capture the capital of the Department Yuwen, Yat beans go to flee Mobei, and later died from the ground, scattered and therefore the Department Yuwen death, due to go in office Yat beans hours after attachment Zhao, Former Yan Yuwen attack department, Zhao days after Wang Shihu sent troops is extended, but before the arrival Zhao Yuwen Department has destroyed.