defensive_works=ravelin (Q22334)

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Triangular outwork that protects the innerwork of a fortification
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English
defensive_works=ravelin
Triangular outwork that protects the innerwork of a fortification

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    defensive_works=ravelin
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    Star-Spangled Banner, Fort McHenry National Monument, Baltimore, Maryland (14311492319).jpg
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    Tag:defensive_works=ravelin (English)
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