Carl Philipp Gottlieb von Clausewitz ( ; ; born Carl Philipp Gottlieb Clauswitz; 1 July 1780 – 16 November 1831) was a Prussian army officer and military theorist who stressed the "moral" (in modern terms meaning psychological) and political aspects of waging war. His most notable work, (On War), though unfinished at his death, is considered a seminal treatise on military strategy and science.
Clausewitz stressed the multiple interactions of diverse factors in war, noting how unexpected developments unfolding under the "fog of war" (i.e., in the face of incomplete, dubious, and often erroneous information and great fear, doubt, and excitement) call for rapid decisions by alert commanders. He saw history as a vital check on erudite abstractions that did not accord with experience. In contrast to the early work of Antoine-Henri Jomini, he argued that war could not be quantified or reduced to mapwork, geometry, and graphs. Clausewitz had many aphorisms, of which one of the most famous is, "War is the continuation of policy with other means."
Name Clausewitz's Christian names are variously given in English-language sources as "Karl", "Carl Philipp Gottlieb", or "Carl Maria." He spelled his own given name with a "C" to identify with the classical Western tradition; writers who use "Karl" are often seeking to emphasize his German (rather than European) identity. "Carl Philipp Gottfried" appears on Clausewitz's tombstone. Encyclopædia Britannica continues to use Gottlieb instead of Gottfried based on older sources, such as military historian Peter Paret, and historian Sir Michael Howard originated the use of "Carl Maria." However, more modern scholars like Christopher Bassford (editor of ClausewitzStudies.org) and Vanya Eftimova Bellinger (who wrote the 2016 biography of Carl's wife Marie von Clausewitz) consider his tombstone a more reliable source than the hand-written birth records used by Paret.
Early life and education Clausewitz was born on 1 July 1780 in Burg bei Magdeburg in the Prussian Duchy of Magdeburg as the fourth and youngest son of a family that made claims to a noble status which Carl accepted. Clausewitz's family claimed descent from the Barons of Clausewitz in Upper Silesia, though scholars question the connection.
His grandfather, the son of a Lutheran pastor, had been a professor of theology. Clausewitz's father, once a lieutenant in the army of Frederick the Great, King of Prussia, held a minor post in the Prussian internal-revenue service. Military career Clausewitz entered the Prussian military service at the age of twelve as a lance corporal, eventually attaining the rank of major general.
Clausewitz served in the Rhine campaigns (1793–1794) including the siege of Mainz, when the Prussian Army invaded France during the French Revolution, and fought in the Napoleonic Wars from 1806 to 1815. He entered the Kriegsakademie (also cited as "The German War School", the "Military Academy in Berlin", and the "Prussian Military Academy," later the "War College") in Berlin in 1801 (aged 21), probably studied the writings of the philosophers Immanuel Kant and/or Johann Gottlieb Fichte and Friedrich Schleiermacher and won the regard of General Gerhard von Scharnhorst, the future first chief-of-staff of the newly reformed Prussian Army (appointed 1809). Clausewitz, Hermann von Boyen (1771–1848) and Karl von Grolman (1777–1843) were among Scharnhorst's primary allies in his efforts to reform the Prussian army between 1807 and 1814.
Clausewitz served during the Jena Campaign as aide-de-camp to Prince August. At the Battle of Jena-Auerstedt on 14 October 1806—when Napoleon invaded Prussia and defeated the Prussian-Saxon army commanded by Karl Wilhelm Ferdinand, Duke of Brunswick—he was captured, one of the 25,000 prisoners taken that day as the Prussian army disintegrated. He was 26. Clausewitz was held prisoner with his prince in France from 1807 to 1808. Returning to Prussia, he assisted in the reform of the Prussian army and state. Johann Gottlieb Fichte wrote On Machiavelli, as an Author, and Passages from His Writings in June 1807. ("Über Machiavell, als Schriftsteller, und Stellen aus seinen Schriften" ). Carl Clausewitz wrote an interesting and anonymous Letter to Fichte (1809) about his book on Machiavelli. The letter was published in Fichte's Verstreute kleine Schriften 157–166. For an English translation of the letter see Carl von Clausewitz Historical and Political Writings Edited by: Peter Paret and D. Moran (1992).
On 10 December 1810, he married the socially prominent Countess Marie von Brühl, whom he had first met in 1803. She was a member of an old German noble Brühl family originating in Thuringia. The couple moved in the highest circles, socialising with Berlin's political, literary, and intellectual élite. Marie was well-educated and politically well-connected—she played an important role in her husband's career progress and intellectual evolution.Bellinger, Vanya Eftimova. Marie von Clausewitz: The Woman Behind the Making of On War. New York/London: Oxford University Press, 2015. She also edited, published, and introduced his collected works.
Opposed to Prussia's enforced alliance with Napoleon, Clausewitz left the Prussian army and served in the Imperial Russian Army from 1812 to 1813 during the Russian campaign, taking part in the Battle of Borodino (1812). Like many Prussian officers serving in Russia, he joined the Russian–German Legion in 1813. In the service of the Russian Empire, Clausewitz helped negotiate the Convention of Tauroggen (1812), which prepared the way for the coalition of Prussia, Russia, and the United Kingdom that ultimately defeated Napoleon and his allies.
In 1815 the Russian-German Legion became integrated into the Prussian Army and Clausewitz re-entered Prussian service as a colonel.See Timothy McCranor, "On the Pedagogical Intent of Clausewitz's On War", MCU Journal vol. 9, no. 1, Spring 2018, pp.133–154. He was soon appointed chief-of-staff of Johann von Thielmann's III Corps. In that capacity he served at the Battle of Ligny and the Battle of Wavre during the Waterloo campaign in 1815. An army led personally by Napoleon defeated the Prussians at Ligny (south of Mont-Saint-Jean and the village of Waterloo) on 16 June 1815, but they withdrew in good order. Napoleon's failure to destroy the Prussian forces led to his defeat a few days later at the Battle of Waterloo (18 June 1815), when the Prussian forces arrived on his right flank late in the afternoon to support the Anglo-Dutch forces pressing his front. Napoleon had convinced his troops that the field grey uniforms were those of Marshal Grouchy's grenadiers. Clausewitz's unit fought heavily outnumbered at Wavre (18–19 June 1815), preventing large reinforcements from reaching Napoleon at Waterloo. After the war, Clausewitz served as the director of the Kriegsakademie, where he served until 1830. In that year he returned to active duty with the army. Soon afterward, the outbreak of several revolutions around Europe and a crisis in Poland appeared to presage another major European war. Clausewitz was appointed chief of staff of the only army Prussia was able to mobilise in this emergency, which was sent to the Polish border. Its commander, Gneisenau, died of cholera (August 1831), and Clausewitz took command of the Prussian army's efforts to construct a to contain the great cholera outbreak (the first time cholera had appeared in modern heartland Europe, causing a continent-wide panic). Clausewitz himself died of the same disease shortly afterwards, on 16 November 1831.
His widow edited, published, and wrote the introduction to his magnum opus on the philosophy of war in 1832. (He had started working on the text in 1816 but had not completed it.); She wrote the preface for On War and had published most of his collected works by 1835. She died in January 1836.
Theory of war Clausewitz was a professional combat soldier and a staff officer who was involved in numerous military campaigns, but he is famous primarily as a military theorist interested in the examination of war, utilising the campaigns of Frederick the Great and Napoleon as frames of reference for his work. He wrote a careful, systematic, philosophical examination of war in all its aspects. The result was his principal book, Vom Kriege (in English, On War), a major work on the philosophy of war. It was unfinished when Clausewitz died and contains material written at different stages in his intellectual evolution, producing some significant contradictions between different sections. The sequence and precise character of that evolution is a source of much debate as to the exact meaning behind some seemingly contradictory observations in discussions pertinent to the tactical, operational and strategic levels of war, for example (though many of these apparent contradictions are simply the result of his dialectical method). Clausewitz constantly sought to revise the text, particularly between 1827 and his departure on his last field assignments, to include more material on "people's war" and forms of war other than high-intensity warfare between states, but relatively little of this material was included in the book. Soldiers before this time had written treatises on various military subjects, but none had undertaken a great philosophical examination of war on the scale of those written by Clausewitz and Leo Tolstoy, both of whom were inspired by the events of the Napoleonic Era.