DNF, this would probably be better off titled "The Book at (World) War (II)", because at least within the first 100 pages, we only really read about a sliver of historical wars, and then a large swath of World War II. I also feel like this is a series of dry factoids in search of a premise. The information presented didn't feel very cohesive, and it was difficult to figure out where things were going and how it related to the title/summary of what I thought I was getting into.
I like the cover art though. I have a reproduction of this particular image on my wall at home (sans book info, of course). The original can be found here: https://www.loc.gov/item/2002709066/