第二次世界大战期间，苏联情报机关得到了一个令人不安的消息，德国制造出了一种新的具有巨大破坏力的化学武器。纳粹法西斯想在实战中得到进一步的测试，然后再大规模的应用。苏军情报机关决定：为避免灾难的发生，同时获得可向盟国提供纳粹犯罪的证据。为了这一目的，指挥部派遣了以经验丰富的米纳埃夫大尉为首的五人小分队，在敌后实施了空降········
Having been discharged from the Marines for a hayfever condition before ever seeing action, Woodrow Lafayette Pershing Truesmith (Eddie Bracken) delays the return to his hometown, feeling that he is a failure. While in a moment of melancholy, he meets up with a group of Marines who befriend him and encourage him to return home to his mother by fabricating a story that he was wounded in battle with honorable discharge. They make him wear a uniform complete with medals and is pushed by his new friends into accepting a Hero's welcome when he gets home where he is to be immortalized by a statue that he doesn't want, has songs written about his heroic battle stories, and ends up unwillingly running for mayor. Despite his best efforts to explain the truth, no one will listen.
故事发生在第二次世界大战末期，当时墨菲和他的战友被一艘纳粹德军潜艇击沉，除了他以外，战友们无一生还，墨菲被路易士救起并同路易士成为好友，墨菲心中却一直有个结，就是想炸毁那艘德国潜艇，并凭借一己之力搞到了一颗从德国潜艇上发射的但却并未引爆的鱼雷。但此时二战结束的消息传来了，而墨菲却绝对忘不了纳粹德军所做过的一切，一直不肯放过那艘德国潜艇，他能成功吗？
