Just trying to catch up here. How about having the tunnel just behind a trench filled with dry grass etc. The trench would afford protection from the storm and once lit (by arrow) any slavers trying to jump the fire trench would land squarely on the hidden tunnel. Yet the fire would be more contained. If the slavers tried to go around the trench they could be met by armed settlers.
It is a lot of digging, I know, and a lot of dirt, but the dirt could be used also.
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