Battle of Ümera
1210 CE.
Shown on the map at 57.500°, 25.417°.
Battle of Ümera (Estonian: Ümera lahing), also known as the Battle of Imera (Latvian: Kauja pie Imeras), was a battle during the Livonian Crusade between the Livonian Brothers of the Sword, their Christian Livonian and Latgalian allies, and the Estonians. The Battle was fought near the Jumara, a tributary of the Gauja River in August or September 1210.
Text from the Wikipedia article Battle of Ümera, licensed CC BY-SA 4.0.