Battle of Gvozd Mountain
1097 CE.
Shown on the map at 44.900°, 15.517°.
The Battle of Gvozd Mountain took place in 1097 and was fought between the army of Petar Snačić and King Coloman I of Hungary. It was a decisive Hungarian victory, which ended the War of the Croatian Succession and served as a turning point in Croatian history.
Text from the Wikipedia article Battle of Gvozd Mountain, licensed CC BY-SA 4.0.