A picket (archaically, picquet
ariant form ''piquet'' is a soldier, or small unit of soldiers, placed on a defensive line forward of a friendly position to provide timely warning and
screening against an enemy advance. It can also refer to any unit (e.g. a
scout vehicle,
surveillance aircraft or
patrol ship) performing a similar function. A picket guarding a fixed position may be known as a sentry or guard.
Origins
Picket (Fr. , a pointed stake or peg, from , 'to point or pierce'), is thought to have originated in the
French Army
The French Army, officially known as the Land Army (, , ), is the principal Army, land warfare force of France, and the largest component of the French Armed Forces; it is responsible to the Government of France, alongside the French Navy, Fren ...
around 1690, from the circumstance that an
infantry
Infantry, or infantryman are a type of soldier who specialize in ground combat, typically fighting dismounted. Historically the term was used to describe foot soldiers, i.e. those who march and fight on foot. In modern usage, the term broadl ...
company on
outpost duty dispersed its
musketeers to watch, with a small group of
pikemen called ''piquet'' remaining in reserve. It was in use in the
British Army
The British Army is the principal Army, land warfare force of the United Kingdom. the British Army comprises 73,847 regular full-time personnel, 4,127 Brigade of Gurkhas, Gurkhas, 25,742 Army Reserve (United Kingdom), volunteer reserve perso ...
before 1735 and probably much earlier.
Usage
''Picket'' now refers to a unit (either naval or army) maintaining a watch. This may mean a watch for the enemy, or other types of watch e.g. fire picket. This can be likened to the art of sentry keeping.
[
]
A staggered picket consists of, for example, two soldiers where one soldier is relieved at a time. This is so that on any given picket one soldier is fresh, having just started the picket, while the other is ready to be relieved. Although each soldier is required to maintain watch for the full duration of a shift, halfway through each shift a new soldier is put on watch.
Historically it was used extensively in
Zachary Taylor's army during the
Mexican-American War, as described by
Samuel Chamberlain.
See also

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Picket boat, small naval launch, used for patrolling harbour defences
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Radar picket
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Screening (tactic)
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Screw picket
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Skirmisher
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Point man
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Vedette (sentry), a mounted sentry or outpost
Notes
References
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Force protection tactics
Military units and formations
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