Battle of Lerin
1916 CE.
Shown on the map at 40.783°, 21.400°.
The Battle of Lerin or Battle of Florina or Chegan offensive was an offensive operation of the Bulgarian army fought between 17–28 August 1916, during the First World War, in which they conquered the city of Florina (in present-day Greece, but known in Bulgaria as Lerin) but failed to take Chegan.
Text from the Wikipedia article Battle of Florina, licensed CC BY-SA 4.0.