Batu's raid of 1240 in Ruthenia
In 1240, Batu Khan led a raid into Ruthenia as part of the Mongol invasion of Kievan Rus'. It took place three years after Batu's 1237 conquests of Volga Bulgaria and the Principality of Vladimir-Suzdal.
Source: Wikipedia — Batu's raid of 1240 in Ruthenia (CC BY-SA 4.0)