It was rocky soil, treed mountains.
So they couldn't really grow anything.
The discovery of fire is important because you are able to create heat and cook food. Heat increases your chances of survival in cold environments and cooking your meat means that is slower to spoil. Also fire can protect you from land predators. Lastly fire led to the creation on metal weapons and pottery.
The time period that it was in
They gained experience in combat and they were able to learn how to use their environment effectively
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