The 1824 German Kriegsspiel game has been widely referred to as the start of modern professional wargaming. This book, aims to explore the British development of that early game in the 19th century. Much of the material has not been in the public domain since it was first published. The contents of this book include: Map Manoeuvres: An Introduction to Kriegsspiel (1839) The Rules for Kriegsspiel by Captain Baring (1872) A newspaper report on the German Game of War (1878) A discussion about how to create wargaming terrain in Aids to Kriegsspiel (1897) The Dangers of Kriegsspiel and Political Officers (1899) The problems with creating imaginary maps for war games (1888) Bellum, an English Kriegsspiel Variant (1909) The first medieval wargame in Kriegsspiel and the Teaching of Military History (1890) The Game of Polemos as played at RUSI (1888) A wargame with a political message, Lieutenant Henry Chamberlain's RN New Game of Invasion (1888)