A tactical formation (or tactical order) is the arrangement or deployment of movable military forces such as infantry, cavalry, AFVs, military aircraft, or naval vessels.
Formations were found in tribal societies, such as the pua rere of the Māori.
[1] Ancient or medieval formations include shield walls (skjaldborg in Old Norse), phalanxes (lines of battle in close order), testudo formations, and skirmish lines.
Tactical formations include:[2][3] "FM 3-21.71 Chapter 3".
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