Battle of Komarów
1920 CE.
Shown on the map at 50.633°, 23.483°.
The Battle of Komarów, or the Battle of Zamość Ring, was one of the most important engagements of the Polish-Soviet War. It took place between 20 August and 2 September 1920, near the village of Komarowo (now Komarów) near Zamość. It was the last large battle in Europe in which cavalry was used as such and not as mounted infantry. The battle ended in a disaster for the Soviet 1st Cavalry Army, which sustained heavy casualties and barely avoided being surrounded and destroyed. After the battle, the morale of the 1st Cavalry Army collapsed, and it no longer remained an effective fighting force.
Text from the Wikipedia article Battle of Komarów, licensed CC BY-SA 4.0.