[livrem]

I have quite a few books on this topic. Perla's was probably the first that I read and it is good, but to anyone interested in the topic I would first recommend Jon Peterson's "Playing at the World" ("A History of Simulating Wars, People and Fantastic Adventures, from Chess to Role-Playing Games"). It's a book about how D&D came to be and covers many topics, but the section on wargames is very well researched and detailed (and I enjoyed the rest of the book as well).

My second recommendation is CG Lewin's "War Games and their History". It is a bit lighter on the history of military professional games, even if there is a chapter or two on that, but the chapters on non-professional wargames are amazing. The author has a personal collection of games going back to the 19th century and the book is full of photos and descriptions of obscure games that I really enjoyed reading about and that I never found in any other source. It covers games up to around 1950, so it does not get into any of the more well-known modern history of wargames (starting with Avalon Hill in the 1950's).