Clausewitz died without completing
Vom Kriege, but despite this his ideas have been widely influential in
military theory and have had a strong influence on German military thought specifically. Later Prussian and German generals, such as
Helmuth Graf von Moltke, were clearly influenced by Clausewitz: Moltke's widely quoted statement that "No operational plan extends with high certainty beyond the first encounter with the main enemy force" is a classic reflection of Clausewitz's insistence on the roles of chance, friction, "fog", uncertainty, and interactivity in war. Clausewitz's influence spread to British thinking as well, though at first more as a historian and analyst than as a theorist. That view assumes, however, a set of values as to what constitutes "rational" political objectives—in this case, values not shaped by the fervid
Social Darwinism that was rife in 1914 Europe. One of the most influential British Clausewitzians today is
Colin S. Gray; historian
Hew Strachan (like Wilkinson also the
Chichele Professor of Military History at Oxford University, since 2001) has been an energetic proponent of the
study of Clausewitz, but his own views on Clausewitz's ideas are somewhat ambivalent. With some interesting exceptions (e.g.,
John McAuley Palmer,
Robert M. Johnston, Hoffman Nickerson), Clausewitz had little influence on American military thought before 1945 other than via British writers, though Generals
Eisenhower and
Patton were avid readers of English translations. He did influence
Karl Marx,
Friedrich Engels,
Vladimir Lenin,
Leon Trotsky,
Võ Nguyên Giáp,
Ferdinand Foch, and
Mao Zedong, and thus the Communist Soviet and Chinese traditions, as Lenin emphasized the inevitability of wars among capitalist states in the age of imperialism and presented the armed struggle of the working class as the only path toward the eventual elimination of war. Because
Lenin was an admirer of Clausewitz and called him "one of the great military writers," his influence on the
Red Army was immense. The Russian historian A.N. Mertsalov commented that "It was an irony of fate that the view in the USSR was that it was Lenin who shaped the attitude towards Clausewitz, and that Lenin's dictum that war is a continuation of politics is taken from the work of this [allegedly] anti-humanist anti-revolutionary." The idea that war involves inherent "friction" that distorts, to a greater or lesser degree, all prior arrangements, has become common currency in fields such as business strategy and sport. The phrase
fog of war derives from Clausewitz's stress on how confused warfare can seem while one is immersed within it. The term
center of gravity, used in a military context derives from Clausewitz's usage, which he took from
Newtonian mechanics. In U.S. military doctrine, "center of gravity" refers to the basis of an opponent's power at the operational, strategic, or political level, though this is only one aspect of Clausewitz's use of the term.
Late 20th and early 21st century The deterrence strategy of the United States in the 1950s was closely inspired by President
Dwight Eisenhower's reading of Clausewitz as a young officer in the 1920s. Eisenhower was greatly impressed by Clausewitz's example of a theoretical, idealized "absolute war" in
Vom Kriege as a way of demonstrating how absurd it would be to attempt such a strategy in practice. For Eisenhower, the age of nuclear weapons had made what was for Clausewitz in the early-19th century only a theoretical vision an all too real possibility in the mid-20th century. From Eisenhower's viewpoint, the best deterrent to war was to show the world just how appalling and horrific a nuclear "absolute war" would be if it should ever occur, hence a series of much-publicized nuclear tests in the Pacific, giving first priority in the defense budget to nuclear weapons and to their delivery-systems over conventional weapons, and making repeated statements in public that the United States was able and willing at all times to use nuclear weapons. In this way, through the
massive retaliation doctrine and the closely related foreign-policy concept of
brinkmanship, Eisenhower hoped to hold out a credible vision of Clausewitzian nuclear "absolute war" to deter the Soviet Union and/or China from ever risking a war or even conditions that might lead to a war with the United States. After 1970, some theorists claimed that
nuclear proliferation made Clausewitzian concepts obsolete after the 20th-century period in which they dominated the world. John E. Sheppard Jr., argues that by developing nuclear weapons, state-based conventional armies simultaneously both perfected their original purpose, to destroy a mirror image of themselves, and made themselves obsolete. No two
powers have used nuclear weapons against each other, instead using diplomacy,
conventional means, or
proxy wars to settle disputes. If such a conflict did occur, presumably both combatants would be
annihilated. Heavily influenced by the war in Vietnam and by antipathy to American strategist
Henry Kissinger, the American biologist, musician, and game-theorist
Anatol Rapoport argued in 1968 that a Clausewitzian view of war was not only obsolete in the age of nuclear weapons, but also highly dangerous as it promoted a "zero-sum paradigm" to international relations and a "dissolution of rationality" amongst decision-makers. One prominent critic of Clausewitz is the Israeli military historian
Martin van Creveld. In his 1991 book
The Transformation of War, Creveld argued that Clausewitz's famous "Trinity" of people, army, and government was an obsolete socio-political construct based on the state, which was rapidly passing from the scene as the key player in war, and that he (Creveld) had constructed a new "non-trinitarian" model for modern warfare. Creveld's work has had great influence. Daniel Moran replied, 'The most egregious misrepresentation of Clausewitz's famous metaphor must be that of Martin van Creveld, who has declared Clausewitz to be an apostle of Trinitarian War, by which he means, incomprehensibly, a war of 'state against state and army against army,' from which the influence of the people is entirely excluded." Christopher Bassford went further, noting that one need only
read the paragraph in which Clausewitz defined his Trinity to see "that the words 'people,' 'army,' and 'government' appear nowhere at all in the list of the Trinity's components.... Creveld's and Keegan's assault on Clausewitz's Trinity is not only a classic 'blow into the air,' i.e., an assault on a position Clausewitz doesn't occupy. It is also a pointless attack on a concept that is quite useful in its own right. In any case, their failure to read the actual wording of the theory they so vociferously attack, and to grasp its deep relevance to the phenomena they describe, is hard to credit." For an opposing view see the sixteen essays presented in
Clausewitz in the Twenty-First Century edited by
Hew Strachan and Andreas Herberg-Rothe. In military academies, schools, and universities worldwide, Clausewitz's
Vom Kriege is often (usually in translation) mandatory reading. Some theorists of management look to Clausewitz—just as some look to
Sun Tzu—to bolster ideas on the concept of leadership. The Swedish
Paradox Development Studio (PDS), a studio focused on creating
grand strategy games, has named one of their main
videogame engines Clausewitz, in reference to the eponymous prussian officer. ==See also==