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All round defence
Defensive fighting position
Defensive fighting position
All-around defense or perimeter defense is a type of defensive fighting position intended to give military units the ability to repel attacks from any direction.
The positioning of the outer defensive fighting positions of a unit, is circular or triangular, from a bird's-eye view.
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).

When a group of soldiers relocate as a part of a defensive operation, a perimeter defense can be temporarily maintained without cover.
References
References
- "fire guard" [https://archive.today/20120714045105/http://news.google.com/newspapers?nid=2206&dat=19440603&id=kXRYAAAAIBAJ&sjid=gD0NAAAAIBAJ&pg=6554,305253 The term "all-around defense" used in a newspaper in 1944]
- https://www.marines.mil/news/publications/Documents/FM%203-21.8%20%20The%20Infantry%20Rifle%20Platoon%20and%20Squad_5.pdf {{Webarchive. link. (2012-09-13 "8-133. A perimeter defense allows the defending force to orient in all directions.")
- "Archived copy".
- https://www.marines.mil/news/publications/Documents/FM%203-21.8%20%20The%20Infantry%20Rifle%20Platoon%20and%20Squad_5.pdf {{Webarchive. link. (2012-09-13 "The trace of the platoon is circular or triangular rather than linear")
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