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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 (DFP) is a type of earthwork constructed in a military context, generally large enough to accommodate anything from one soldier to a fire team (or similar sized unit).
Terminology
Tobruk type positions are nam ...
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 (DFP) is a type of earthwork constructed in a military context, generally large enough to accommodate anything from one soldier to a fire team (or similar sized unit).
Terminology
Tobruk type positions are nam ...
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.
One version consists of soldiers forming a wide circle around the soldier in charge (and radioman
Radioman (RM) was a rating for United States Navy and United States Coast Guard enlisted personnel, specializing in communications technology.
History of the rating
The rating was created originally in 1921. In 1997, under the direction of Chi ...
etc.) with a spacing typically of 3–4 metres between each person (on the circle's circumference
In geometry, the circumference (from Latin ''circumferens'', meaning "carrying around") is the perimeter of a circle or ellipse. That is, the circumference would be the arc length of the circle, as if it were opened up and straightened out t ...
).
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 (DFP) is a type of earthwork constructed in a military context, generally large enough to accommodate anything from one soldier to a fire team (or similar sized unit).
Terminology
Tobruk type positions are nam ...
*Infantry tactics
Infantry tactics are the combination of military concepts and methods used by infantry to achieve tactical objectives during combat. The role of the infantry on the battlefield is, typically, to close with and engage the enemy, and hold territ ...
*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 ...
*Fortification
A fortification is a military construction or building designed for the defense of territories in warfare, and is also used to establish rule in a region during peacetime. The term is derived from Latin ''fortis'' ("strong") and ''facere' ...
References
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