Siege of Novo Brdo
1455 CE.
Shown on the map at 42.600°, 21.433°.
The siege of Novo Brdo was a successful siege led by Mehmed the Conqueror and Ishak Bey on Novo Brdo, defended by Demetrios Jakšic, during the Second Serbian campaign in 1455.
Text from the Wikipedia article Siege of Novo Brdo (1455), licensed CC BY-SA 4.0.