There does not seem to be a thread here dedicated to this fascinating old game, designed by a Dr Griffith and first published in 1883. It has been mentioned in the past in other threads, particularly by TMP user Bob Cordery ( although difficult to find, obscured by many posts discussing a more modern game called Polemos ) . He also made some excellent blog-posts about the game ( link ) and most importantly he transcribed the rules for second edition and wrote about the game for the History of Wargames book The British Kriegsspiel ( 1872 ) Including RUSI's Polemos ( 1888 ) : Early Wargames Volume 2 ( link ) .
That book also contains the full text and illustrations from at least two contemporary newspaper articles about the game. I browsed the British Newspaper Archives for a few hours and found a few more mentions of the game as well as some ads from the publisher. It looks as if the game was actually somewhat popular among British officers of the 1880's and early 1890's before fading into obscurity.
The first two versions ( 1883 and 1886 ) were sold with pre-painted miniatures mounted on painted bases, plus unbased miniatures used as reserves to be scattered on the table representing losses. I wrote some more details about how that worked on bgg ( link ) .
Third edition ( 1890 ) abandoned miniatures for classical Kriegsspiel-blocks.
Both versions were played on supplied gridded cloths, to which ( likewise included ) terrain could be added. Hills were included as cardboard contraptions placed below the cloth to deform it. The flat hill-tops had different rules from the slopes formed around them ( different impact on LOS and protection from enemy fire ) .
In late 1890 the designer Dr Griffith was invited to the War Academy in Germany to present the game to The Emperor and some of his generals. I wrote a bit more about that on bgg a few days ago ( link ) .
While the game in all editions were deterministic without dice, there was various types of hidden information that made it impossible to know at what moment a specific enemy unit would be eliminated. Third edition had losses tracked on paper, but players were not allowed to look even at their own loss-sheets during their own turns. Even that form of light fog of war for your own units is not very common in games from any era.
The complete rulebook for either second or third edition is just a few pages. The second edition rulebook available in that book is probably of more interest to miniature gamers. But in that version the rules for entrenchments and terrain are not included. Third edition book is available in the British Library and you can order scans from them and that will give you the rules for entrenchments and terrain that probably work as-written also for second edition. I plan to write up a summary of them on bgg sometime and if there is interest I can paste that here as well. Even if I think second edition rules look like more fun and really recommend that anyone interested buy that book from History of Wargames playing without terrain on just a plain grid probably gets old very quickly.