Usage History of 'fortress'

The following chart shows how frequently 'fortress' appeared in printed materials over time. For example, the word 'fortress' occurred 8 times in books in 1524 and 331,296 times in 2008. From 1524 to 2008, the word 'fortress' was used a total of 7,773,527 times in books scanned by Google. See Reference: Google Ngram project.

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