The cartoon starts with a back story of the 13th century – showing Mongol invasion and the Battle of the Kalka River. A century and a half passes; in Moscow prince Dmitry Ivanovich explains to his son, why he rides to The Horde. And meanwhile Tatar general Mamai hears the report of his servant about the defeat of Mongol and Tatar forces in the Battle of the Vozha River and decides to make a new campaign against Rus’.