The Battle of the Vorskla River was a great battle in the medieval history of Eastern Europe. between the Kazakh-Tatars of the Golden Horde, under NAME_1 and NAME_2, and the armies of Tokhtamysh and a large Crusader force led by the Grand Duke Vytautas of Lithuania. The battle ended in a decisive Kazakh-Tatar victory for the Golden Horde, It was fought on ?