1948年解放战争时期，连长谷子地（张涵予 饰）率领九连47名战士在汶河岸执行掩护大部队撤退的任务，团长刘泽水（胡军 饰）下令，以集结号为令，听见号响就撤退
惨烈的战争在炮弹的轰鸣中开始，九连的战士死伤惨重，排长焦大鹏（廖凡 饰），牺牲前说自己听见了集结号，谷子地自己没有听见，他决定死守阵地 九连打退了敌人三次进攻，炸毁二辆坦克，歼敌无数，全连除连长谷子地，47人全部阵亡
这场战争改变了谷子地的人生 由于部队改了编号，谷子地找不到组织，九连牺牲的烈士们也被认定为失踪 谷子地开始了艰难的寻找，为九连的兄弟们讨个说法，也为了探明当年集结号的真相
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