I can’t read German, so I don’t really know what it’s about, but this page has some excellent antique plates of European uniforms from the late 1700s and early 1800s. (The dates actually range from 1697 to 1867). It’s worth a look if your doing wars of that period. There are quite a few Napoleonic period plates in here.
19th Century
Chinese Visual Sourcebook
I like to make my wargaming terrain as authenthic as possible. I found the Chinese Visual Sourcebook to be useful when I was working on my 25mm Boxer Rebellion project.
The Great War Syndicate
Written in 1889, The Great War Syndicate is about a cabal of wealthy businessmen who plan to start a war between European states so they can profit from selling weapons to both sides.
Count this one as a “wars of futures past.”
The Great War In England 1897
The Great War In England 1897 is an 1894 novel about an invasion of England by France and Russia. Interestingly, Germany comes in on England’s side.
It’s an interesting entry in what you might call the literature of the wars of futures past.
La Guerre Infernale
La Guerre Infernale is a 30 issue illustrated magazine published in 1908 about a future war between France and Germany.
Even if you don’t read French, the Victorian Science Fiction illustrations are terrific. Lots of inspiration for your VSF games.