I first encountered these things in the Middle Ages scenario, where there's a line of three between England and Wales. I garrisoned the one in my territory, but the AI ignored the ones on his side, which were on hills and would have made my life miserable. Instead, they turned into a nice staging area for my invasion force.
I have yet to get very far in C3C, but my strategy would be the following -
1. Start out as Industrious.
2. Dedicate three workers to building forts.
3. Build a barricade from every OTHER fortress so they offer support to 2 neighboring fortresses.
The naming seems off - a barricade sounds less than a fortress. You don't see a castle and say "what a barricade!"
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