Siege of the Hexamilion Wall
1446 CE.
Shown on the map at 37.926°, 22.973°.
The Siege of Hexamilion Wall was a military engagement between the Ottoman army and the Byzantine forces in Morea. The Ottomans led by the Sultan Murad II, attacked and destroyed Hexamilion wall which was defended by the Byzantine Despots.
Text from the Wikipedia article Siege of the Hexamilion Wall (1446), licensed CC BY-SA 4.0.