Battle of Ula
1564 CE.
Shown on the map at 54.898°, 29.155°.
The Battle of the Ula or Battle of Chashniki was fought during the Livonian War on 26 January 1564 between the Grand Duchy of Lithuania and the Tsardom of Russia on the Ula River (tributary of the Daugava River) north of Chashniki in the Vitebsk Region. The Russian troops, unarmed and moving in a loose formation, were taken by complete surprise and defeated, losing their large wagon train.
Text from the Wikipedia article Battle of the Ula, licensed CC BY-SA 4.0.