Kriegsspiel[a] is a genre of wargaming developed by the Prussian army in the 19th century to teach battlefield tactics to officers. The word kriegsspiel literally means "wargame" in German, but in the context of the English language it refers specifically to the wargames developed by the Prussian army in the 19th century. Kriegsspiel was the first wargaming system to have been adopted by a military organization as a serious tool for training and research.
Most forms of kriegsspiel involve two teams of players and one umpire gathered around a map. The map represents a battlefield. Each team is given command of an imaginary army, which is represented on the map using little painted blocks. Each block represents some kind of troop formation, such as an artillery battery or a cavalry squadron. The players command their troops by writing their orders on paper and giving them to the umpire. The umpire reads these orders and moves the blocks across the map according to how he judges the imaginary troops would interpret and execute their orders. The outcomes of combat are computed mathematically.
- 1 History
- 2 Reisswitz rules (1824)
- 3 Tschischwitz rules (1862)
- 4 See also
- 5 Footnotes
- 6 External links
By definition, a "wargame" is a strategy game that attempts to realistically represent warfare. The earliest wargames were invented in the German states around the turn of the 19th century. They were derivatives of chess, but the pieces represented real military units (cavalry, infantry, artillery, etc.) and the squares were color-coded to represent different types of terrain. These early wargames were not taken seriously by the military because they were not realistic enough. The pieces were constrained to move across a grid in chess-like fashion: only a single piece could occupy a square (even if that square represented, say, a square mile), and the pieces had to move square by square. This, of course, did not represent how real troops maneuvered in the field. The grid system also forced the terrain to take unnatural forms, such as rivers flowing in straight lines and right angles.
In response to these criticisms, a Prussian nobleman and wargaming enthusiast named George Leopold von Reisswitz set out to develop a more realistic wargame wherein the units could move about in a free-form manner over more natural terrain.
Reisswitz first experimented with a table covered in a layer of damp sand. He sculpted the sand into a three-dimensional model battlefield, with hills and valleys. He used little wooden blocks to represent troop formations. The Prussian princes heard about Reisswitz's project and asked for a demonstration. He showed it to them in 1811, and they enthusiastically recommended the game to their father, King Wilhelm III.
Reisswitz did not want to present the king a table of damp sand, so he set about constructing a more impressive apparatus. In 1812, Reisswitz presented to the king a wooden table-cabinet. The cabinet's drawers stored all the materials to play the game. The cabinet came with a folding board which, when unfolded and placed on top of the cabinet, provided a gaming surface about six feet by six feet in size. Instead of sculpted sand, the battlefield was made out of porcelain tiles, upon which terrain features were depicted in painted bas-relief. The tiles were modular and could be arranged on the table surface create a custom battlefield (the scale was 1:2373). Troop formations were represented by little porcelain blocks. The blocks could be moved across the battlefield in a free-form manner; dividers and rulers were used to regulate movement.
The royal family was delighted by Reisswitz's game, and frequently played it. However, it was not adopted by army instructors nor sold commercially. The apparatus that Reisswitz made for the king was too expensive for mass-production. But more importantly, his system was not complete and required some improvisation on the part of the players. For instance, the rules for resolving the effects of gunfire and hand-to-hand combat were not fully worked out. Reisswitz may have been too distracted by the upheavals of the Napoleonic Wars to perfect his game. By 1816, Reisswitz seemed to have lost interest in wargaming altogether. The development of the wargame was continued by his son, Georg Heinrich Rudolf Johann von Reisswitz.
The Prussian army adopts wargaming (Reisswitz Jr., 1824)
Georg Heinrich Rudolf Johann von Reisswitz was a junior officer in the Prussian army. He took over the development of his father's wargame after his father lost interest in it. He developed the game with the help of a circle of junior officers in Berlin. The prince eventually heard of Reisswitz Jr.'s project and, having fond memories of playing Reisswitz Sr.'s wargame, joined the son's gaming circle.
In the earlier wargames of Hellwig and Venturini, units were like chess pieces in that when attacked, they were simply killed and removed from play, even though the pieces represented groups of soldiers. By contrast, units in Reisswitz's game could suffer partial losses yet still remain on the battlefield. A unit might withstand several rounds' worth of enemy attacks before finally collapsing. Reisswitz's game was thus the first to incorporate unit hitpoints. It also modeled variable damage: The casualties inflicted by an attacker on his enemy were determined using dice.
Reisswitz Jr.'s game was designed to be played on accurate, large-scale (1:8000) topographical maps. The Prussian army had recently begun using such maps, which were the product of new advances in cartography and printing. These maps may have not been available to Reisswitz Sr. and previous wargame designers, but they were available by the 1820s and Reisswitz Jr. took advantage of them. Using topographical maps allowed for more natural terrain and the play of battles in real locations.
Reisswitz Jr.'s great innovation, however, was the introduction of an umpire. The players did not directly control the troop blocks on the game map. Rather, they wrote down their orders for their troops and gave them to the umpire. The umpire would then move the blocks across the game map according to how he judged the imaginary troops would interpret and carry out the players' orders. When the troops engaged the enemy on the map, it was umpire who rolled the dice, computed the effects, and removed slain units from map. The game also could simulate the fog of war. The umpire would place on the map blocks only for the troops which were in visual range of both sides. The umpire kept a mental track of where the hidden troops were located, and only deployed blocks for them when they came into view of the enemy. The umpire also arbitrated situations which the rules did not explicitly cover, which plugged any gaps in Reisswitz Jr.'s system. Naturally, this required the umpire to be an impartial and experienced officer.
In early 1824, the prince invited Reisswitz Jr. to present his wargame to the king and his senior generals at Berlin Castle. They were impressed and officially endorsed his game as a training tool for the officer corps. The Chief of the General Staff, General von Müffling declared: "this is no ordinary sort of game, this is schooling for war. I must and will recommend it most warmly to the army." The king ordered that every regiment receive a kriegsspiel set. Reisswitz established a workshop by which he could mass-produce and distribute it. He sold the game's material in a box-set priced at 30 thalers. This was thus the first wargame to be widely adopted by a military as a serious tool for training and research.
Wargaming after Reisswitz Jr.'s death
In 1826, Reisswitz was transferred away from Berlin to the provincial city of Torgau. This was interpreted as a banishment: allegedly, he had made offensive remarks about his superiors. He committed suicide in 1827. This disgrace was detrimental to the progression of his wargame for obvious reasons. It wasn't until 1860 that the game was widely played in the military. Until then, it survived thanks to the efforts of a small number of wargaming clubs. The earliest of these clubs was the Berlin Wargame Association.[b] Another prominent club was the Magdeburg Club, managed by General von Moltke. These clubs continued to develop Reisswitz's game, but they avoided mentioning his name in their publications. In 1828, the Berlin Wargame Association published a limited expansion to Reisswitz's system. In 1846, they released a fresh wargaming manual which received a second edition in 1855. These updates sought to make kriegsspiel more realistic, but they also made the rules more complicated.
Wilhelm von Tschischwitz published a kriegsspiel manual in 1862[c] that incorporated new technological advances such as railroads, telegraph, and breech-loading cannons; and which used conventional gaming dice. It also greatly simplified the rules, making the wargame even simpler than Reisswitz's original version. Tschischwitz's rules went through three editions between 1862 and 1869. In 1869, Colonel Thilo von Trotha published his own wargaming treatise which went through three editions and had more complicated rules.
The Austro-Prussian War of 1866 and the Franco-Prussian War of 1870 broke a long period of peace for the German states, which made many officers feel a pressing need to better familiarize themselves with the conduct of war. This led to a surge in interest in kriegsspiel among Prussian officers.
The free kriegsspiel movement
Lieutenant Wilhelm Jacob Meckel published a treatise in 1873[d] and another in 1875[e] in which he expressed four complaints about the overcomplicated rules of kriegsspiel: 1) the rules constrain the umpire, preventing him from applying his expertise; 2) the rules are too rigid to realistically model all possible outcomes in a battle, because the real world is far too complex; 3) the computations for casualties slow down the game and have a minor impact on a player's decisions anyway; 4) few officers are willing to make the effort to learn the rules. The fourth issue was the most serious, as the Prussian military struggled to meet the growing demand for umpires. Meckel proposed dispensing with some of the rules and giving the umpire more discretion to arbitrate events as he saw fit. The only things he kept were the dice and the losses tables for assessing casualties.
In 1876, General Julius von Verdy du Vernois proposed dispensing with all the rules and tools completely and allowing the umpire to arbitrate the game entirely as he saw fit.[f] This form of kriegsspiel came to be known as free kriegsspiel (counterpart to Reisswitz's rigid kriegsspiel) and was well-received by the officer corps because it was easier to learn and allowed umpires to apply their own expertise.
The spread of wargaming beyond Germany
Kriegsspiel attracted little attention outside of Prussia before 1870. Reisswitz Jr. travelled to Russia where he demonstrated kriegsspiel to the Russian court, but he failed to win them over. In 1825, the French general Auguste de Marmont witnessed a kriegsspiel match in Berlin and commissioned a translation of Reisswitz's manual which was submitted to the French army in March 1829. A Dutch translation appeared in 1836.
This all changed in 1870, when Prussia defeated France in the Franco-Prussian War. Many credited the Prussian army's superior performance to its wargaming tradition, and this led to great worldwide interest in kriegsspiel. The first kriegsspiel manual in English, Rules for the Conduct of the War-Game by E. Baring, based on the system of Wilhelm von Tschischwitz, was published in 1872 for the British army and received a royal endorsement. In the United States, Charles Adiel Lewis Totten published Strategos, the American War Game in 1880, and William R. Livermore published The American Kriegsspiel in 1882. In 1873, a group of students and teachers at Oxford University founded the University Kriegspiel [sic] Club, which was the world's first recreational wargaming club.
Kriegsspiel in the present day
Kriegsspiel has undergone a minor revival in the English-speaking world thanks to translations of the original rulebooks by a British wargaming enthusiast named Bill Leeson.
Reisswitz rules (1824)
Reisswitz's wargame was an instructional tool designed to teach battlefield tactics to Prussian officers. It therefore aimed for maximum realism. The participants were expected to be well-versed in how battles were waged in the early 19th century. This was particularly true for the umpire, who had to arbitrate situations which the rules did not cover using his own expertise.
Kriegsspiel is an open-ended game with no fixed victory conditions. The objectives of the respective teams are determined by the umpire and typically resemble the goals that an army might pursue in a real battlefield situation, such as expelling the enemy from a certain defensive position or inflicting a certain number of casualties.
The game is played between two teams and one umpire. Either team can have any number of players, but Reisswitz recommended 4 to 6 players each and that they be equal in size. The players in a team will divide command of the troops between them and establish a hierarchy. Only the umpire needs to be fully familiar with the rules, as he manipulates the pieces on the map and computes the outcomes of combat, whereas the players describe what they want their troops to do as if they were issuing orders to real troops in the field.
The materials required include:
- Rectangular pieces that represented various kinds of troop formations
- Rulers and dividers
- A topographical map (recommended scale is 1:8000)
- A rulebook
- Note paper
- Supplemental sheets of paper to track casualties and other information
The map represents the battlefield. Troops on the battlefield are represented on the map by little rectangular pieces. In Reisswitz's time, these piece were made of lead, but modern reconstructions typically use plastic. Each piece is painted with markings that denoted what kind of unit it represented (cavalry, infantry, etc.) and the team it belonged to. The dimensions of each piece matched the dimensions of the actual troop formation it represented, to the same scale as the map. Thus, each piece occupied an area on the map proportional to the space the actual troop formation would occupy in the field.
Order of play
The umpire establishes the scenario of the game. He decides what the tactical objectives of the respective teams are, what troops they are provided with and how those troops are initially deployed on the battlefield. The umpire will then assign each team the appropriate troop pieces for their units. If there are multiple players in a team, the teammates will divide control of their troops and establish a hierarchy of command in a way that should resemble Prussian military doctrine, subject to the umpire's approval.
Players do not speak to each other. Instead, they communicate with their teammates and the umpire through written messages. This is so that the enemy team cannot hear their plans. This is also so that the umpire can delay or block messages if he feels the circumstances on the battlefield warrant it. In the early 19th century, officers in the field communicated over long distances through messengers (there was no radio in those days). Messengers needed time to reach the recipient, and could be delayed or intercepted by the enemy. The umpire can simulate this problem by holding on to a player's message for a round or two before giving it to the recipient, or never giving it.
Likewise, the players command their imaginary troops through written orders, which they submit to the umpire. The players are not allowed to manipulate the pieces on the map themselves — that is for the umpire to do. The umpire will move the pieces across the map according to how he judges the imaginary troops would interpret and execute the players' orders.
The umpire places pieces on the map only for troops which he judges are visible to both sides. If a unit disappears from the enemy army's line of sight, the umpire will remove the piece from the map and keep it aside. Naturally, this means the participants must keep a mental track of the positions of troops whose pieces are not on the map.
The players themselves may be represented on the battlefield with pieces that represent officers and their bodyguards. The positions of the officers on the battlefield affects how the players can communicate with each other and the troops. Officers can be slain in battle like any other soldier, and if that happens the player ceases to participate in the game.
The course of the game is divided into rounds. A round represents two minutes of time. Thus, in a round the troops can perform as many actions as they realistically could in two minutes of time, and Reisswitz's manual provides some guidelines. There is, for instance, a table which lists movement rates for the various troop types under different conditions, e.g. in a round, a cavalry squadron can move 400 paces[g] over open ground, 250 paces through light forest, and 100 paces up inclines.
The umpire uses dice to determine how much damage that attacking units inflict upon the enemy. The dice designed by Reisswitz are of unique design, with each face displaying a multitude of numbers and symbols that denoted different damage scores, measured in points, for different situations. There are five dice:
- Die I is used to determine ranged damage inflicted by line infantry and skirmishers fighting in the open, hand-to-hand combat results when both sides were even, and whether a howitzer attack sets a village on fire.
- Die II is used to determine ranged damage by skirmishers firing from cover, and hand-to-hand combat results when the odds are 3:2.
- Die III is used to determine damage inflicted by artillery under good conditions.
- Die IV is to determine hand-to-hand combat results when the odds are 3:1.
- Die V is used to determine damage inflicted by artillery under bad conditions, and hand-to-hand combat results when the odds are 4:1.
Each unit has a point value which represents how many points of damage the unit in question can absorb before "dying". In modern gaming parlance, this "point value" is analogous to "hitpoints". The number of hitpoints a unit has is determined by the type of unit, the number of men in it, and their formation. For instance, a cavalry squadron with 90 riders has 60 hitpoints, and a line infantry half-battalion with 450 men has 90 hitpoints. Individual cavalry riders are "tougher" than infantrymen (1.5 hitpoints per rider vs 0.2 hitpoints per infantryman) because they moved faster and in looser formations, which meant a barrage of fire inflicted fewer casualties on them.
In most cases, a piece is simply removed from the map when it has lost all its hitpoints. An exception to this is line infantry. Line infantry had a special function in early 19th century warfare. On the battlefield, infantry stood close together in long lines facing the enemy. A key tactical purpose of a line of infantry was to obstruct the advance of enemy troops. When the line suffered casualties, this resulted in the formation of openings through which enemy troops could slip through. If the defender didn't have reserve infantrymen with which to plug the openings, this was a disaster, as then the enemy could move through the openings to isolate and flank his troops. To represent this phenomenon on the game map, the game provides "exchange pieces" for infantry half-battalion pieces. An exchange piece resembles a regular half-battalion piece but is marked with the fraction 5⁄6 or 4⁄6, which signifies that the half-battalion in question has lost either one sixth or two sixths of its men. The exchange pieces are commensurately smaller in length. So if a half-battalion piece in a line of such pieces is replaced with an exchange piece, this will create an opening in the line because the exchange piece does not completely fill the space that was occupied by the original piece. Furthermore, a half-battalion piece is removed from the map when it loses half of its hitpoints, because a half-battalion that had lost half of its men was considered ineffective in combat (and typically the men just fled the battlefield).
To track hitpoint loss, Reiswtiz's original manual provided sheet of paper called the "losses table". The losses table is divided into columns for line infantry, tirailleurs, jagers, cavalry, and artillery. Each column has a series of numbered dots. At the start of the game, the umpire shall stick one pin for each piece on the map in the first dot of the appropriate column. For instance, if the Red Army begins with three infantry pieces and two cavalry pieces, the umpire will stick three pins in the first dot in the infantry column and two pins in the first dot in the cavalry column. Generally, the dot a pin is stuck in represents how many damage points the corresponding unit has accumulated. When a unit takes damage, the umpire will move the corresponding pin down its column to the appropriate dot. If a pin reaches the bottom of the column, then the corresponding piece is removed from the map, or in the case of line infantry, replaced with an exchange piece. For instance: if a cavalry squadron suffers 10 points of damage, the umpire will move the corresponding pin ten dots down the cavalry column. If the pin reaches the 60th dot in the column, that's as much damage as a cavalry squadron can take, and the umpire will then remove the corresponding piece from the map.
Tschischwitz rules (1862)
Tschischwitz's version of kriegsspiel was very much like Reisswitz's version, but it incorporated new advances in technologies and tactics. For instance, by 1862 the Prussian army had transitioned from muskets to breech-loading rifles and hence troops could inflict casualties at up to 900 paces instead of a mere 400. Whereas Reisswitz used a unique set of dice, Tschischwitz used conventional gaming dice; his manual provided tables with which to translate dice rolls into combat outcomes.
Tschischwitz's game did not use exchange blocks. By 1862, Prussian battle doctrine had moved away from line infantry tactics to an emphasis on wider deployments. To represent this, the 1862 game represents infantry companies individually with their own blocks, so exchange blocks for battalions are no longer required. Rules for deploying skirmishers were also updated to reflect the newer tactics.
Whereas Reisswitz's manual prescribed just one map around which all the participants were gathered, Tschischwitz's manual proposed the option of having multiple maps: one for the umpire which displayed the positions of all troops, and one for each team with displayed only those troops which the respective team could see; and the teams would be placed in separate rooms with their respective maps so that they could not see the other team's map nor the umpire's map.
- German: [ˈkʁiːksˌʃpiːl]
- Berliner Kriegsspiel-Verein
- Wilhelm von Tschischwitz (1862). Anleitung zum Kriegsspiel [Instructions for Wargaming].
- Studien über das Kriegsspiel ("Study of Wargames")
- Anleitung zum Kriegsspiel ("Instructions for Wargaming")
- Julius von Verdy du Vernois (1876). Beitrag zum Kriegsspiel [Contribution to Wargaming].
- Reisswitz used the Prussian imperial system of measurement, wherein 1 pace = 2 feet = 20 decimal inches ≈ 62.7072cm.
- Reisswitz Jr. (1824)
- Peterson (2012):
"...Reiswitz’s wargame was not intended as a commercial offering, like that of Hellwig or Venturini—it was a lavish, custom-built gift for a monarch, with an apparatus fit for a museum; cost-effective manufacturing of the Taktisches Kriegs-Spiel cabinet was simply out of the question."
- Reisswitz Jr. (1824), p. ix:
trans.:"The rules for deciding hand-to-hand attacks, and the method for determining terrain advantage had not been fully worked out, and there were still difficulties with deciding effects from gunfire."
- Peterson (2012):
"The elder Reiswitz’s interests seem to have drifted away from kriegsspiel after the standalone publication of his history of wargaming (Literärisch-kritische Nachrichten über die Kriegsspiele der Alten und Neuern, 1816), so his son assumed charge over the ongoing development of the game."
- Reisswitz Jr. (1824): "Few, and entirely incomplete terrain maps had been published, and even those, with a few exceptions such as the 1:10,000 maps of Saxony, did not give terrain in a large enough scale to allow smaller units to be properly represented."
- Peterson (2012):
"In addition to establishing the general idea and the composition of the opposing forces, the umpire serves as an intermediary for virtually all actions in the game: all movements, all communications and all attacks channel through the umpire, in writing. The players transmit written orders, authored to their units in the persona of a commander, and for the most part the umpire enjoys significant leeway in deciding how these orders will be interpreted."
- Dannhauer (1874), quoted in Peterson (2012)
- Peterson (2012):
"To convert this to a mass-market venture, the younger Reiswitz organized a workshop to manufacture the game, which included a tin foundry, painters and carpenters, as well as the support of the Royal Lithographic Institute to manufacture maps of the appropriate scale."
- Peterson (2012)
- Dannhauer (1874)
- Heistand (1898)
- Heistand (1898): [Tschischwitz] preserved the primitive method of Reisswitz, but adopted less complicated and more practical rules for computing losses."
- Heistand (1898), p. 267
- Heistand (1898): "In 1872 the war game received a great impetus; and, as it was largely played, a great many umpires were required. Certainly there was no lack of officers capable of this function, but there were few with sufficient courage to study and assimilate the complicated rules governing the game."
- Heistand (1898), p. 259: "The central idea of [Meckel's] instructions, remarkable in many ways, was to emancipate the umpire from all rules; but, as on the other hand, it imposed upon him the necessity, above all, of taking into account the losses by fire in his decisions, so it still preserved a set of rules for estimating them, and the dice and tables of losses."
- Perla (1990):
"For von Verdy the reason for wargaming's lack of popularity lay "in the numerous difficulties that beginners run against in handling tables, calculating losses, and the like." He argued strongly that "it would add to the usefulness of the game to be rid of these numerous rules and tables." [...] The essence of von Verdy's approach can be described as the transformation of the umpire from computer to "God." But he was not to be a capricious god, but a conscientious one who would explain his actions and assessments after the game."
- Peterson (2012):
"Verdy du Vernois in his Beitrag zum Kriegsspiel (“Contribution to Wargaming,” 1876) expresses many sentiments similar to the criticisms levied by Meckel: that when a student of military sciences suggests playing a wargame, an all-too-common response is, “We have no one here who knows how to conduct the game properly.” Probing more deeply into the root causes of this, he found the defect to “lie chiefly in the purely technical part of the conduct of the game, the novice failing to understand the rules, or the use of the dice and the table of losses”—this last table referring to the computation of points of damage against units. Verdy du Vernois therefore proposes the obvious: to simply remove those entirely from the game, and to allow the umpire’s assessment of the tactical situation to determine the outcome of any encounter."
- Heistand (1898), p. 248
- Bill Leeson (1989)
- Reisswitz Jr. (25 Feb 1824), in Militär-Wochenblatt no. 402 (6 March 1824)
- Reisswitz Jr. (1824):
"These troop symbols and the map must be to the same scale, and the scale must be large enough for the smallest tactical units to be instantly recognizable. Troops and maps have been prepared to the scale 1:8000 so that 1 Decimal Zoll = 400 paces. [...] Let me stress again that the troop symbols and map must be to the same scale, so that troops only occupy the distance on the map that they would occupy in reality, and so that one move only produces the same results for marches, battles, etc., as two minutes of real time would produce."
- Wilhelm von Tschischwitz. Richard Clarke, ed. The von Tschischwitz Kriegsspiel 1862. Translated by Bill Leeson. Too Fat Lardies.
- Phillip von Hilgers (2000). "Eine Anleitung zur Anleitung. Das Takstische Kriegsspiel 1812-1824" (PDF). Board Games Studies: International Journal For the Study of Board Games (in German) (3): 59–78.
- George Leopold von Reiswitz (1812). Taktisches Kriegs-Spiel oder Anleitung zu einer mechanischen Vorrichtung um taktische Manoeuvres sinnlich darzustellen [Tactical War Game - or, instruction to a mechanical device to simulate tactical maneuvers] (in German). Gädicke. (Scribd backup)
- Georg Heinrich Rudolf Johann von Reisswitz (1824). Anleitung zur Darstellung militairische Manover mit dem Apparat des Kriegsspiel [Instructions for the Representation of Military Maneuvers with the Kriegsspiel Apparatus] (in German). (translation by Bill Leeson, 1989)
- Peter P. Perla (2012) [1st pub. 1990]. John Curry, ed. Peter Perla's The Art of Wargaming: A Guide for Professionals and Hobbyists. The History of Wargaming Project. ISBN 978-1-4716-2242-7.
- Jon Peterson (2012). Playing at the World: A History of Simulating Wars, People and Fantastic Adventures, from Chess to Role-playing Games. Unreason Press. ISBN 9780615642048.
- Heinrich Ernst Dannhauer (11 July 1874). "Das Reiswissche Kriegsspiel von seinem Beginn bis zum Tode des Erfinders 1827" [The Reiswitzian Wargame from its Inception until the death of the inventor in 1827]. Militär-Wochenblatt. Vol. 59 no. 56. pp. 527–532.
- Thilo von Trotha (1874). "Zum Kriegsspiel". Jahrbücher für die deutsche Armee und Marine. pp. 180–193.
- Julius von Verdy du Vernois (1876). Beitrag zum Kriegsspiel [Contribution to Wargaming] (in German). Ernst Siegfried Mittler und Sohn.
- John Curry (2008). Verdy's Free Kriegspiel Including the Victorian Army's 1896 War Game. Lulu.com. ISBN 9781409227960.
- "Foreign War Games". Selected Professional Papers Translated from European Military Publications. Translated by H. O. S. Heistand. Washington D.C.: US Government Printing Office. 1898. pp. 233–289.