"Hellwig's Conquest"
This book is available on Etsy and ebay. Or direct from me.
Letter-sized, perfect bound, w/ color plates, 144 pages, $25 + shipping.
ISBN: 978-0-9822892-5-9
Hellwig's Conquest rulebook on ebay
Hellwig's Conquest rulebook on Etsy
Originally released in Germany in 1780 under the title "Versuch eines aufs Schachspiel gebaueten taktischen Spiels von zwei und mehrern Personen zu spielen", and also known as the Brunswick Wargame or Braunschweiger Kriegsspiel, this is probably the oldest published set of modern wargame rules.
Now for the first time, this classic groundbreaking game is available in a high fidelity English translation.