It was almost certainly used for agriculture. Observation of hunter-gatherer bands in modern times, and archeology have little in the way of skirmishes or warfare prior to the agricultural revolution 10,000 years ago. Not that it never happened, but violence and war are much more endemic to the modern (past 10000 years) era.

> violence and war are much more endemic to the modern (past 10000 years) era.

Given the scantiness of any evidence 10,000+ years ago, I doubt such conclusions can be drawn.

Even chimpanzees engage in war and wanton violence. One would assume this behavior is at least as ancient as the most recent common ancestor we have with the chimpanzee.