Lumifer comments on Open Thread, Aug. 15. - Aug 21. 2016 - Less Wrong
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If nomads united into large hordes to go to war, shouldn't the change in the number of men living together have had some noticeable psychological effect on the warriors? I mean, the Wikipedia says that "a Dunbar's number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships", and surely they had to co-work with lots more people than during peace?
You don't "maintain stable social relationships" with the whole horde, you maintain them with your small unit. And the military hierarchy exists so that people have to coordinate only a limited number of entities: if you're a grunt, you need to coordinate only with people immediately around you; if you're a mid-level officer you coordinate a limited number of platoons, if you're a general you coordinate a limited number of regiments.
A soldier does not meaningfully "co-work" with the whole army.