I'm currently looking for my Encyclopedia of Weapons (Diagram Group) for more accurate weapon availability info, but its in a box somewhere in the house. I may be some time.
In the meantime, I found this under the Wiki entry for "Prehistoric Warfare":
The bow- at least simple ones like self bows- have been around a LONG time.
In the meantime, I found this under the Wiki entry for "Prehistoric Warfare":
Wiki
http://en.wikipedia.org/wiki/Prehistoric_warfare
Beginning around 12,000 BC, combat was transformed by the development of bows, maces, and slings. The bow seems to have been the most important weapon in the development of early warfare, in that it enabled attacks to be launched with far less risk to the attacker when compared to the risk involved in the use of mêlée combat weaponry. While there are no cave paintings of battles between men armed with clubs, the development of the bow is concurrent with the first known depictions of organized warfare consisting of clear illustrations of two or more groups of men attacking each other. These figures are arrayed in lines and columns with a distinctly garbed leader at the front. Some paintings even portray still-recognizable tactics like flankings and envelopments
The bow- at least simple ones like self bows- have been around a LONG time.