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關於逸豆歸如何成為宇文部首領,史籍有二種不同說法。《資治通鑒》記載:333年,當時身為宇文部東部首領的逸豆歸驅逐了其主宇文乞得龜而自立,慕容部鮮卑首領慕容皝出兵聲討,逸豆歸懼而請和;而《魏書》則稱“逸豆歸殺乞得龜而自立”。
慕容皝庶兄慕容翰曾逃奔宇文部,但後來為逸豆歸所忌,遂返慕容部,他對逸豆歸的評語是:“篡竊得國,群情不附。”、“性識庸暗”,並稱當時的宇文部“將帥非纔,國無防衛,軍無部伍。”
343年,逸豆歸遣其相莫淺渾率兵攻前燕(慕容部是其前身),莫淺渾因輕敵而大敗,僅僅逃出一命,士卒皆為燕軍所俘。前燕在次年(344年)出兵攻逸豆歸,攻下了宇文部的都城,逸豆歸逃往漠北,後來死於該地,宇文部也因此散亡,由於逸豆歸在位時依附後趙,前燕攻宇文部時,後趙天王石虎曾出兵相救,但趙軍到達前宇文部已滅亡。
不過,《魏書》的記載卻稱該戰役係發生於345年,結果逸豆遠遁漠北,後來逃往高麗。慕容皝將其部衆五千餘落遷至昌黎(今中國遼寧省朝陽市),宇文部自此散滅。
另外,《周書》則將逸豆歸之名記載為侯豆歸,並稱其子宇文陵曾仕於燕國(前燕或後燕),還曾拜駙馬都尉,被封為玄菟公,後又降於北魏,其後代即存於魏。而後來的西魏太師、北周的實際建立者宇文泰即為逸豆歸的五世孫。
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.