Partisan (military)

A partisan is a member of an irregular military force formed to oppose control of an area by a foreign power or by an army of occupation by some kind of insurgent activity. The term can apply to the field element of resistance movements, examples of which are the civilians that opposed Nazi German or Fascist Italian rule in several countries during World War II.

The French term "partisan", derived from the Latin, first appeared in the 17th century to describe the leader of a war-party.

The initial concept of partisan warfare involved the use of troops raised from the local population in a war zone (or in some cases regular forces) who would operate behind enemy lines to disrupt communications, seize posts or villages as forward-operating bases, ambush convoys, impose war taxes or contributions, raid logistical stockpiles, and compel enemy forces to disperse and protect their base of operations.

One of the first manuals of partisan tactics in the 18th century was The Partisan, or the Art of Making War in Detachment..., published in London in 1760 by de Jeney, a Hungarian military officer who served in the Prussian Army as captain of military engineers during the Seven Years' War of 1756–1763. Johann von Ewald described techniques of partisan warfare in detail in his Abhandlung über den kleinen Krieg (1789).

The concept of partisan warfare would later form the basis of the "Partisan Rangers" of the American Civil War. In that war, Confederate States Army Partisan leaders, such as John S. Mosby, operated along the lines described by von Ewald (and later by both Jomini and Clausewitz). In essence, 19th-century American partisans were closer to commando or ranger forces raised during World War II than to the "partisan" forces operating in occupied Europe. Mosby-style fighters would have been legally considered uniformed members of their state's armed forces.

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