I am not an expert on ancient warfare or the development of military strategy or technology, just a writer needing some background material. That said, this book gave me and will continue to give me what I need for accurate plotting and research. I have also read Roman Warfare by the same author and found that it, too, was very helpful.
What I liked about this book was the simplicity of writing, the quality of illustrations and paper used, and the logical movement of the book from the earliest Roman armies through Late Antiquity. Chapters cover the development of the chain of command through the republic and the Principate, equipment, recruitment and training, frontier duties, battle strategies, sieges, the army's peacetime duties, the layouts of the marching camps and permanent forts, and naval warfare. There are some descriptions about particular battles and war heros as well.
The Complete Roman Army is engaging and easy to read. It is also loaded with fascinating facts, even for a pacifist like myself.