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http://archaeologyinbulgaria.com/2019/05/30/culverin-cannonballs-from-vlad-draculas-1461-victory-over-ottoman-turks-found-in-danube-fortress-zishtova-in-bulgarias-svishtov/
Culverin Cannonballs from Vlad Dracula’s 1461 Victory over Ottoman Turks Found in Danube Fortress Zishtova in Bulgaria’s Svishtov