Note: Do not rely on this information. It is very old.
Kriegspiel
Kriegspiel (War-Game), a game of German origin, introduced in 1824 by Lieutenant von Reiszwitz, played with maps of a large scale and metal blocks coloured red and blue, representing bodies of troops of all kinds. An umpire, with two assistants, superintends the game, which is generally played by two persons with alternate moves. It roughly represents actual military operations, and the players are subject to general rules and special conditions. The game is played largely in the German army, and occasionally in England.