Battle for Nizhniy Novgorod
1439 CE.
Shown on the map at 56.328°, 44.003°.
The Battle for Nizhny Novgorod took place between the Tatar troops under the command of Ulugh Muhammad and Russian troops led by the Grand Principality of Moscow.
Text from the Wikipedia article Battle for Nizhny Novgorod (1439), licensed CC BY-SA 4.0.