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How were medieval castles built in swamps or marshes without draining them?

By this, I mean a castle built without terraforming or draining the swamp; a castle that was built while keeping the swamp intact. Inspired by Monty Python Since apparently, castles built in marshes ...
4
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1answer
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What were the grooves in the side of the walls at the rear entrance of Harlech and Beaumaris gatehouses for?

The back of Harlech and Beaumaris castle gatehouses seem to have grooves in the side of the wall for a portcullis, but there is no groove above so if there was one was there it could not be raised. ...