Why did the settlers of Jamestown surround their settlement with large wooden walls?

Surrounding Jamestown Fort was a triangular wooden palisade (a fence or wall made ... (Wattle and daub is a building material used for making walls, in which a ... at Jamestown Settlement may have served as the colonial governor's house. ... to move inland away from the fertile river valleys that had long been their home.

most camps were located in the area of the general government in occupied poland

a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.