步阐,字仲思,徐州临淮淮阴人,魏晋时期大臣,丞相步骘次子。继承父业,为西陵督,加昭武将军,封西亭侯。凤皇元年,召为绕帐督。家世在西陵,卒被征命,忧谗畏讥,于是归顺晋朝。孙皓使陆抗西行讨伐,步阐兵败被杀,被夷灭三族。
步阐,是吴丞相步骘次子,步协之弟。父亲步骘、兄长步协相继去世後,步阐继任为西陵督,又被任命为昭武将军,封西亭侯。步阐以战略理由,上表请求皇帝孙皓迁都荆州的武昌,孙皓批准。但因为武昌在长江中游,物资由江东向荆州逆江运送不便,引发民怨,隔年十二月,孙皓又将国都迁回建业。步阐受孙皓征召作绕帐督,前往京城建业。
步阐,一家自父亲步骘开始,经过兄长步协,到步阐三人在西陵共有四十馀年,步阐接到命令要他离开西陵,感到非常不安,害怕是自己有过失,又怕是有人在孙皓面前诬陷他,对自己不利。同年,步阐举西陵城投降晋国,并将兄长步协的两个儿子步玑、步璿,送到晋国的首都洛阳当人质,晋国任命步阐当都督西陵诸军事、卫将军、开府仪同三司、侍中,兼遥领交州牧,封宜都侯。步玑被任命监督江陵军事、左将军、散骑常侍、卢陵太守,改封江陵侯。当时江陵、卢陵都不在晋国之下,因此官职爵位都是虚封,步玑之弟步璿则被任命为给事中、宣威将军,封都乡侯。
吴国的陆抗立刻派遣将军左奕、吾彦、蔡贡攻击步阐,晋帝司马炎则派遣荆州刺史杨肇,率军前往西陵迎接步阐,车骑将军羊祜率步军攻打江陵,巴东监军徐胤率水军攻击建平,以救援步阐。陆抗急切命令各路军队,在西陵周围建筑强力的围堵,从赤溪到故市,对内包围步阐,对外防御晋兵。吴军将领们很不满,希望急攻西陵,要在晋军到达前消灭步阐,但陆抗认为西陵城坚粮足,而且全城的防御工事都是当年他亲自建立的,不可能快速攻陷,等到晋军从北方来,吴军却没有防备,腹背受敌,势将无法抵挡,而吴国将领们仍要攻打步阐,陆抗为了让大家心服,让众将尝试攻击,果然失败。围堵建筑完成後,羊祜的五万晋军也兵临江陵,陆抗再次力排众议,认为西陵的得失比江陵更重要,便亲自率军前往西陵。
十一月,晋军杨肇率军到达西陵,陆抗命孙遵及留虑抵抗羊祜、徐胤二路晋军,自己对抗杨肇。此时吴国将军朱乔、营都督俞赞投降杨肇,陆抗认为晋军必定会依据俞赞的情报,攻击吴军中最弱的外族部队,於是改派精兵守候,待杨肇军前来时,箭矢石块如雨般落下,使杨肇部队受到严重挫败。
十二月,杨肇无计可施,趁夜溜走,陆抗想要追击,又怕城里的步阐趁机出击,便只大鸣战鼓,假装要大举进兵的样子,杨肇军的将士被鼓声吓得惊慌失措,都把妨碍行动的盔甲和武器抛下,盲目逃跑。陆抗仅用五千轻装部队袭击,便杀得杨肇惨败,羊祜等其它二路兵马也只好撤退,步阐所据的西陵城失去了所有外援,终究抵挡不住陆抗的攻打而陷落。
西陵城破之日,步阐及同谋叛变的将吏数十人被杀,夷灭三族,而城中有数万人被胁迫一同反叛,则被陆抗请准赦免。步协之子步玑之前与弟弟步璿去了洛阳,应该没有被杀,但《三国志》中却说步氏泯灭,只有步璿逃过一劫,延续步氏的香火,步玑为什么没有继承步氏血脉,就不得而知了。步阐被夷三族,受诛者包括婴孩,在当时被认为是过度残忍的惩罚,后来陆抗的后代同样遭到满门诛灭的命运,有人把这两件事相提并论,认为是陆抗诛步氏三族的报应,今日看来此说不足信。
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