http://archaeologyinbulgaria.com/2019/05/30/culverin-cannonballs-from-vlad-draculas-1461-victory-over-ottoman-turks-found-in-danube-fortress-zishtova-in-bulgarias-svishtov/
Thanks for posting the link Duncan. A fascinating and detailed report. What's not to like about linking a site to Vlad and a Roman cohort.