Warriors, Artists, and Technicians #1
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A warrior is a member of a class, generally it is a privilege of birth. The warrior is not a universal concept but variants of it exist world wide. The first warriors could also be called shaman-kings. Most likely they developed from hunter-gather groups that occupied mountains, jungles or dry plains. These hunter-groups, often at war with each other, were in the habit of raiding the first agricultural settlements. At some point, these settlements probably got the idea that they could offer the hunter-groups ruler-ship in exchange for protection. They thus became the first warrior classes.
These warrior shaman's most powerful weapon was inspiring fear. Chinese historians record this kind of shaman-commander charging off into battle with a poisonous snake in each hand, wild

In China, this was the time when the Zhouyi was written. The Zhouyi

This is not just history. The warrior-shaman-kings are still around in isolated parts of Indonesia. (See Don F. Draeger's beautiful book the The Weapons & Fighting Arts of Indonesia
Part two: Warrior Codes