The common "barbarian" Celtic warrior was not more or less a "city slicker" that a pre-marian Roman Soldier. They were farmers, the Celts also knew farming, they knew towns and cities etc.etc. They were not these raw-meat-eating Arnold Schwarzeneggers you see in some Hollywood movies, and the Romans were no sissies.
Celtic warriors were quite well equipped, their armor was not less good that the one of a pre-marian Roman Soldier and their weapons were of high quality too. Of course they had their rituals, some fought naked etc.etc. But on the other hand their cav. was surely much stronger that the Roman.
A post-marian legionnary - i think - could compete with any warrior of any people at any time.
As for the germans: The Germans were mostly farmers, and - different what most people think - did not go hunting much more often than Celts or Romans. They also had Blacksmiths, carpenters, potters and different craftsmen. They did not know money, though.
They knew different sorts of wheat, rye, oat, millet, but most important: barley. They knew pease and different berries, also honey from wild bees. They bred mostly beefs, sheep, swines, poultry but also horses, dogs and cats. And they knew how to make cheese.
According to Tacitus, the Germans lived monogamous, which was quite unique among "the barbarians"
And they brewed beer, so they could NOT be as barbarous as one would think.
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