根據韓戰時期實在戰事改編。1950年6月25日，北韓揮軍超出三八線突襲南韓，三日霸占漢城（今首爾），戰線賡續南進。在美軍及結合國軍聲援下，南韓軍逆勢反擊。美軍指揮官麥克亞瑟提出代號為「鐵鉻措施」的仁川登陸操持，該操持急需一支大除夕隊的兵力從側翼阻擊擾敵、出奇制勝，顛末歷程長沙里堵截北韓軍的補給線。由于任務本身極端艱鉅，加上南韓國軍當時兵力懦弱，無法抽調充足正規軍聲援，軍方不得不把這項任務交付給772邏輯門生兵推行，這些門生兵勻稱年紀只有17歲，僅僅領受了兩星期的軍事訓練，在毫無實戰履歷的環境下投身戰場。行軍路上固然殺機重重，戰友外部也諸多衝突，幼年氣盛，迸收回種種角力。仁川登陸戰前夕，長沙里登陸任務準期推行，這群徒有一腔熱血但戰力懦弱的門生們，無可克制地領受福氣中最肆虐的測驗：穿越炮火與波浪，浴血長灘，馀下步隊身陷敵軍重重圍剿，直至彈盡糧盡，掙扎于陣亡與倖存的分界線上…BasedontheincredibletruestoryofJangsariLandingOperation.WhenNorthKoreainvadesSouthKoreaonJune25,1950,theypushedSouthKoreaanditsallyUSArmytothesouthernmostcity.U.S.GeneralMacArthurplannedOperationChromite,whichwouldseethejointalliedforcestotakebackastrategiclocationofInchonandinorderforittosucceed,heneededasmallbattaliontoflanktheNorthKoreanarmyandeliminatetheirsupplylineatJangsaribeach.HavinglosthisfamilyonhisretreatawayfromNorthKoreabeforetheWar,amodelstudentChoiSung-pilenlistsinthearmytofightfortheSouth.KiHa-ryunisarebelliousyouthfromtheSouthwhovolunteerstofightinthewar.Allofthe772studentsandyouthsarelikethemwhoarebarelyoutofschoolwithonly2weeksofbootcamptraining.TaskforcecommanderCaptainLeeMyung-junknowsthatit’salongshot,buthehasnochoicebuttoleadthemintoacrucialmission.Meanwhile,USwarcorrespondentMaggiebravesthedangersofthebattlefieldtoreportonthewarinthefrontlines.ShefeelsempathyfortheKoreanstudentswhomustgointobattleonbehalfoftheveteransoldiersfortheircountry,andtriestodowhatshecanonherendtorescuethem.Withlittleammo,scantfoodsuppliesandraggedyweapons,canthestudentssuccessfullycarryouttheirmissionandreturnhomesafely?