Wings Out of Shadow — Fred Saberhagen

In Wings a timid, future-time historian with an interest in one of Earth's most horrific conflicts finds his knowledge strangely useful in the on-going war with Berserkers. Berserkers are automated war machines programmed by a long dead alien civilization to destroy life in all its forms. Fred Saberhagen further explores humanities struggle against the Berserkers in ten novels and over twenty-five short stories.