In 1896 the British Government published this paper which formalised the adoption of War-gaming in the Empire forces. The rules closely follow those created in 1812 by Reiswitz under the German name of “Kreigsspiel”.
These rules describe and give guidance on how a group of officers can use small blocks laid out on a large-scale map to represent various troops, and then issue orders to those troops. It further describes how those blocks move and how the umpires act as both judges and messengers.