I have a keen interest in war history starting with the Napoleonic Wars from an early age. I am no longer so young and have quite a library by now, but whish I had had this book a little sooner.
Sure it is a dictonary, but it is an extensive one. It is not a dictonary of words, you will not find elan or other fancy french terms there. What you will find is almost every person worthy of note during the Napoleonic Age (including persons you never knew about, such as the French cavalry leader who led the charge at the Raevsky's Redoubt his life, background and what he had done until then), clarifications on units, explanation of social and political background and most importantly detailed description of all important battles, campaigns, conflicts and skirmishes. Many of these are covered over a few pages with maps included. In this area it is one of the best consice books on the subject I have ever come across and I find that the battles are usually much better covered than in many Napoleonic books that do not focus on a single engagment and even for these it is helpful to read a clear summary of events to better see the big picture.
If you are completely new to the Napoleonic Wars this book is not good as an introduction (it is a dictonary), but is handy to have as a study guide. If you however have some fundamental knowlage af the subject this book is terrific. From time to time I even read this book by itself and since under each heading there usually are references better explained elsewhere I can spend long hours doing just this.
My favorite dictonary, I cannot recommend it enough.