Why were primitive ambush forces usually small?

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In the context of military tactics, primitive ambush forces were typically small—usually numbering no more than a few dozen or a few hundred combatants—primarily because concealment was vital to the success of the operation.1

Maintaining stealth while stalking an enemy in difficult terrain, such as forests, mountains, or swamps, required significant skill and intimate knowledge of the surroundings, which became increasingly difficult to manage with larger groups. Furthermore, these operations lacked a sophisticated logistic apparatus to support larger numbers, and there were no established tactical units or complex command structures to coordinate them.1