in drawing any firm conclusions on "primitive warfare".
Brief SWC thread here
, where 120mm cites the 1995 dissertation "The Origin of War", by Dr. J.M.G. Van Der Dennen, which is still here
. Interesting read; huge bibliography & discusses various theories. You will find a lot of controversy by following the obvious Google leads.
A proof of organized primitive warfare (Neolithic; one of many) is attached -"combate de arquero", from a Spanish cave (Morella la Vella, provincia de Castellón) - punch this