The invasion of Earth by the Posleen, a vicious alien race, results in the conquest and devastation of much of the world; in the United States, however, a few enclaves of humans make a stand along the Appalachian Mountain range using guerrilla tactics, modern weaponry, and a host of dirty tricks. Major Mike O'Neal and his forces, used to fighting the Posleen in space, now wage a desperate battle for survival on their home ground. Continuing the story begun in A Hymn Before Battle and Gust Front, Ringo demonstrates his flair for fast-paced military sf peopled with three-dimensional characters and spiced with personal drama as well as tactical finesse. A strong addition to most libraries' sf collection.