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Q&A: What are some of the temporary fortifications used in the Middle Ages?

Question by : What are some of the temporary fortifications used in the Middle Ages?
My question refers to the temporary fortifications used to enforce a building/city that is not a fortress. I can find a lot of information on siege weapons, but not so much on fortifications(I’m not sure how common it was). As for the time period, anything in the Middle Ages is fine.

Best answer:

Answer by Lili
There is some information on this site, which mentions a few temporary examples:

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