Beyond the grey bastions of Fort Adams a long-drawn sunset was splintering up into a thousand fires, and the radiance caught the sail of a catboat as it beat out through the channel between the Lime Rock and the shore.
There are no more uses of "bastion" in the book.
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These rules are a bastion against corruption.
The universities were the last bastion of freedom, but they were purged of anyone who questioned official propaganda shortly after the coup.