Germanic tribes their defenses(not at their towns ofcourse) were small hills with wooden fences and small "doorways' in the hills, Belgian tribes used to plant long rows of bushes and hedges to make some form of wall on strategic places. It may sound stupid, but just try to walk through a hedge and it makes sense.
Would be so amusing to have that implemented on reasonable terms as forts, but who am I kidding eh? ^^
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