Battle of Bileća
1388 CE.
Shown on the map at 42.867°, 18.433°.
The Battle of Bileća was fought in August 1388 between the forces of the Kingdom of Bosnia, led by Grand Duke Vlatko Vuković, and the Ottoman Empire under the leadership of Lala Shahin Pasha. The Ottoman army broke into Hum, the kingdom's southern region. After days of looting, the invaders clashed with the defending force near the town of Bileća, north-east of Dubrovnik. The battle ended with an Ottoman defeat.
Text from the Wikipedia article Battle of Bileća, licensed CC BY-SA 4.0.