Battle of Adamclisi
101 CE.
Shown on the map at 44.083°, 27.950°.
The Battle of Adamclisi was a major clash during the Dacian Wars, fought in the winter of 101 to 102 between the Roman Empire and the Dacians near Adamclisi, in modern Romania.
Text from the Wikipedia article Battle of Adamclisi, licensed CC BY-SA 4.0.