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All-around defense or perimeter defense is a type of 
When a group of soldiers relocate as a part of a defensive operation, a perimeter defense can be temporarily maintained without cover.
defensive fighting position
A defensive fighting position is a type of Earthworks (engineering)#Military use, earthwork constructed in a military context, generally large enough to accommodate anything from one soldier to a fire team (or similar sized unit).
Terminology ...
intended to give military units the ability to repel attacks from any direction.
The positioning of the outer defensive fighting position
A defensive fighting position is a type of Earthworks (engineering)#Military use, earthwork constructed in a military context, generally large enough to accommodate anything from one soldier to a fire team (or similar sized unit).
Terminology ...
s of a unit, is circular or triangular,http://www.marines.mil/news/publications/Documents/FM%203-21.8%20%20The%20Infantry%20Rifle%20Platoon%20and%20Squad_5.pdf "The trace of the platoon is circular or triangular rather than linear" from a bird's-eye view
A bird's-eye view is an elevated view of an object or location from a very steep viewing angle, creating a perspective (graphical), perspective as if the observer were a bird in flight looking downward. Bird's-eye views can be an aerial photog ...
.
One version consists of soldiers forming a wide circle around the soldier in charge (and radioman etc.) with a spacing typically of 3–4 metres between each person (on the circle's circumference
In geometry, the circumference () is the perimeter of a circle or ellipse. The circumference is the arc length of the circle, as if it were opened up and straightened out to a line segment. More generally, the perimeter is the curve length arou ...
).
When a group of soldiers relocate as a part of a defensive operation, a perimeter defense can be temporarily maintained without cover.
See also
*Defensive fighting position
A defensive fighting position is a type of Earthworks (engineering)#Military use, earthwork constructed in a military context, generally large enough to accommodate anything from one soldier to a fire team (or similar sized unit).
Terminology ...
* Infantry tactics
*List of military tactics
This article contains a list of military tactics.
The meaning of the phrase is context sensitive, and has varied over time, like the difference between "strategy" and "tactics".
General
* Exploiting prevailing weather – the tactical use of w ...
*Fortification
A fortification (also called a fort, fortress, fastness, or stronghold) is a military construction designed for the defense of territories in warfare, and is used to establish rule in a region during peacetime. The term is derived from Lati ...
References
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