This book invokes a fresh and new approach to Roman warfare. Armstrong lays out a different picture of Rome's military expansion, showing how the origins of its empire began with the individual activities of independent war bands that only gradually began to work together to take on larger conquests. Rather than viewing the construction of Rome's empire through the political lens of the Senate House, Armstrong centers his discussion on the development of warfare outside the city. It is a thoroughly engaging and well-written book that gives new insight into the early armies that laid the groundwork for Rome's empire.