There still reverberated in her mind the crashes of the two impregnable citadels of her life, thundering to dust about her ears.
Public feeling against the Yankees and all their allies was at fever heat at the very time when the town learned of the engagement, for the last citadel of Georgia’s resistance to Yankee rule had just fallen.
There are no more uses of "citadel" in the book.
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If the citadel falls, all is lost.
The New York Stock Exchange is a citadel of capitalism.