It always struck me as odd that Jamestown had a wall around the colony. Were they wary of the Native Americans? Did they think the French or Spanish may attack? If they did, would the wall have given them any amount of reasonable protection?
You might be interested in this previous answer of mine.
To summarize, though: the colonists were, for good reason, wary of local Native hostility, and made building their stockade a priority in the first few months after their landing. Both George Percy and John Smith wrote of being attacked on the first night of their landing by a native war party, and the colonists made a retreat to their ships. While the walls were built, the ships provided bombardment and cover fire and were used as an offshore fortification. It took nearly a month to build the walls, and only after they were complete did the ships weigh anchor to return to England.
The colony was also a valuable target for hostile European forces, as well, but Jamestown's particular concern was far more for the locals than the Spanish or French.