故事以大(dà )晟北境战事为背景(jǐng ),苍狼王八万(wàn )铁骑来犯,顾山河领(lǐng )五千步兵迎敌,深陷(xiàn )绝境。老将铁(tiě )向权袖手旁观,监军(jun1 )王挥月(yuè )暗中(zhōng )通敌,构陷将士,按原(yuán )结局,顾山河所部全(quán )军覆没,家族(zú )蒙难。太史令沈文远(yuǎn )因鸣冤(yuān )获罪,临刑时借史书之力(lì )穿越回悲剧前夕。他(tā )主动向顾山(shān )河示警,留在军中出(chū )谋划策,献策突围,奇(qí )袭敌粮,稳固(gù )军心。女医佐柳千羽(yǔ )也逐渐放下(xià )戒备,与众人并肩作(zuò )战。顾山河忍辱游说(shuō )铁向权换来(lái )援军,沈文远设计揭(jiē )穿王挥(huī )月通(tōng )敌罪行,获取敌军情(qíng )报。决战之时,陈敢率(lǜ )三百人死守(shǒu )营寨掩护主力转移(yí )。沈文远与柳千羽退守