1. battle formation; military formationMilitary
Wikipedia definition
2. Tactical formationA tactical formation (or order) is the arrangement or deployment of moving 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, and ancient or medieval formations which include shield walls, phalanxes (lines of battle in close order), Testudo formation and skirmishers.
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