Flavio, you seem to forget that up until the very recent past metal was indeed the "money" of Africa, with individuals using whatever was at hand or that they could afford IRREGARDLESS of what the enemy or other tribe was using.
If an enemy attacked with an iron tipped spear and all that you had was a copper knife or club, you used what you had.
You seem to be forgetting that almost every tribe had some sort of wooden throwing stick or club that was used both for hunting and fighting in addition to knives, swords, spears and bows and arrows.
If you look closely you'll find that there are small, slim wooden shields almost indistinguishable from Australian aboriginal pieces found throughout Africa, and that the sticks were often ignored in favor of the more elaborite weapons by anthroplogists, who often didn't even realize the import placed upon them by their owners or that they were indeed made by THAT tribe.
Genetic DNA evidence seems to indicate that the Australian Bushmen and the African Bushmen are among or ARE the oldest human groups remaining on the planet with some also feeling that the true Philippine and Indonesian negrito are not too distant from them themselves, lending strong support to the "wave" theory of human migration.
Mike
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