Ned Ames, Here's yet more proof, from New Scientist, no less that the massacre at Jebel Sahaba was the oldest known instance of mass violence 13,4000 years ago.

This group were pre-agriculture (just barely) but seem to have been fighting over resources, something that I have stipulated to possibly happening before.

“At about 13,400 years old, Jebel Sahaba is one of the earliest sites displaying signs of mass conflict. Violence between communities seems to have become more common once people settled in one place to farm, which had begun happening by about 12,000 years ago. But evidence of organised violence among more mobile communities, like those represented by Jebel Sahaba, is unusual.”

Earliest known war was a repeated conflict in Sudan 13,400 years ago