I was thinking more at the micro-level. You are already beginning at a point where "societies" are organized into separate agriculture and military sectors. I am wondering whether some people always confronted others with violence to enslave them and/or get access to their agricultural products or if all soldiers began as farmers. I guess the simplest way to put it would be to ask whether soldiers originated from farmers or whether soldier was an occupation designed for acquiring food without having to do the work of producing it.
I actually researched this when writing my book because I wanted to know if the "peacful" societies really existed before the neolithic period, which just happens to be when farming starts. I don't have my referneces near me right now but I found that there were many societies with fortifications and weapons were found, at digs, which were designed (aparently) for killing humans, which came from the early neolithic period. I seriously doubt that lazy people just grouped and raided. The population of the world at the time was not such that this would be allowable (less than 10million). In later periods raiding was possible, but remember that Vikings and Mongals farmed too.
In the end these sorts of behaviours are attributable to a diverse range of factors and cannot be disolved into a simple action/reaction behaviour. The Romans wanted access to resources (which they often farmed), trade, levy to defend against others, and slaves. The Vikings wanted riches, sometimes slaves (not many), and internal political leverage (good raid = strong leader).
My book features raids of two types: Ritualistic raids where no one is really hurt and the purpose is the exchange of women for the genepool (as seen in many paleo-indian cultures) and raiding for food and supplies when in dire need.
That's another good question: what came first, the practice of making something useful that could be traded for surplus food and other raw materials or the practice of war to take and enslave?
Actually, I would suggest that they both occurred simultaneously. Both really require farming. A raid on a mesolithic community would give you a small amount of food (very small) and mostly perishable. Any slaves you took would need to be feed. Slavery and raiding of pre-agriculturaly peoples was probably not unheard of but not really in anyone's best interest.
Thanks, I googled it. The source I read said that people not situated in agricultural communities used war and trade to get access to the surpluses of the farmers. It's interesting that there was no mention of nomadic farming, since I would guess that farmers would have needed to constantly seek new land as their current farming plots became barren. I assume they didn't have knowledge of fertilization yet, though I suppose that must have developed in that time.
I guess your point is that farming increased population-capacity and increased population resulted in a need for new land, which caused war. So there weren't just bands of lazy people that formed to conquer farmers and take their harvests and/or enslave them so that they wouldn't have to farm for themselves?