《极乐堡垒》中，莫娜汉饰演的玛吉是一位战功卓著的美军医务兵，同时也是一位单身母亲。她在阿富汗服役15个月后归来，却发现五岁的儿子几乎不认识自己，反而与前夫和他的新女友更加亲近。
　　就在她接回儿子，慢慢重新建立起亲情的纽带，逐渐适应战地之外的日常生活，还与一位机械师发生浪漫恋情的时候，战事又起，她不顾众人反对，毅然决定重新应征入伍，回归战场。

　　Based on a true story of the American Civil War, culminating at the Battle of New Market, May 1864. A group of teenage cadets sheltered from war at the Virginia Military Institute must confront the horrors of an adult world when they are called upon to defend the Shenandoah Valley. Leaving behind their youth, these cadets must decide what they are fighting for.