This book is ideally suited for those wanting a good overview of the history of warfare. Be forewarned, though, that this book should not be used as a reference except for general facts in the history of warfare. Battle formations, major skirmishes and important people make up the majority of the content. Smaller details are not included, for the most part.
Overall, this is a great book to own. I bought it for a college course a few years back and kept it afterwards. This is a good starting-off point for any interested in military history.