"A reconstruction of the Prussian military wargame Kriegsspiel, based on a ruleset developed by Georg Heinrich Rudolf Johann von Reiswitz in 1824, <a href=""https://commons.wikimedia.org/wiki/File:Kriegsspiel_1824.jpg"">photo</a> by <a href=""https://twitter.com/mkirschenbaum/status/815032700209860609"">Matthew Kirschenbaum</a> / <a href=""https://creativecommons.org/licenses/by-sa/4.0/deed.en"">CC BY 4.0</a>"
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