[Noachian]

A hunter-gatherer, while he may have a few favorite spots, can hunt or gather anywhere. If he's chased out of a particular area by others, he can still feed himself.

What you're saying is: There's always another hunting ground around the corner so why defend this one? That doesn't wash. Ancient hunting grounds weren't like McDonalds.

Most likely ancient hunting grounds were fiercely defended precisely because good ones were scarce and when hunters found one they fought to keep it.

Fighting over hunting grounds the way American Indians did, before the advent of the white man, is a more likely scenario, and probably the source of warfare itself. By the time agriculture came along warfare was most likely a well developed skill that farmers used to defend their land.

[Redcloak]

As evidence, my teacher pointed to the Indians of California. Even in pre-Columbian times California was (relatively speaking) densely populated; however, the tribes didn't fight over who got to hunt or gather in a particular area. California Indians, as a rule, rarely fought one another despite the crowded conditions.

There is, however, one notable exception to this peaceful picture: The Mojaves. They were one of the most aggressive and warlike tribes in North America. (They actually liked the Spanish since killing an armored man shooting a gun from horseback was more of a challenge. Much more fun that going after other Mojaves!) The Mojaves, in addition to being California's only warlike tribe, were the area's only agriculturalists. They fought to protect farmland along the Colorado River.