This is an excellent general work for those interested in ancient warfare in the western world (Ancient Egypt and Fertile Crescent, and Greece, Macedonia, Rome and Carthage). It is organized thematically, with chapters on Infantry, Cavalry, Siege, Naval and (one of my favorites) Command & Control (including communications and troop organization in the field); each chapter then proceeds chronologically, with detailed treatment (including illustrations and strategic maps) of specific battles which the author feels illustrate important military developments and/or concepts.
What stands out about this book is actually the strength of its quasi-anecdotal approach to military history. The book is very specific about particular engagements and sticks close to the sources when possible, leaving out a lot of the history in between. Despite this, there are some unique insights and details to be found here that I haven't found in other military-historical reading for this period. A thematic chapter I would've loved to have seen, however, would've been one on developments in military levies (the organization and training of the military at home).
This is a book that I leave accessible in my living room for browsing and looking up facts my brain has mislaid. If you want a thorough account of strategic and political history, you'll have to go elsewhere: Warry's _Warfare in the Classical World_ , which fills in a lot of the history between emblematic and important confrontations in the field, for instance, makes an excellent companion piece to this volume.