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Wikipedia definition
1. Star fortA star fort, or trace italienne, is a fortification in the style that evolved during the age of gunpowder, when cannon came to dominate the battlefield, and was first seen in the mid-15th century in Italy. Passive ring-shaped (enceinte) fortifications of the Medieval era proved vulnerable to damage or destruction by cannon fire, when it could be directed from outside against a perpendicular masonry wall.
Read “Star fort” on English Wikipedia
Read “星形要塞” on Japanese Wikipedia
Read “Star fort” on DBpedia

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