The Battle of the Kalka River (, ) took place on May 31, 1223, between the Mongol Empire (led by Jebe and Subutai) and Kiev, Galich, and several other Rus' principalities and the Cumans, under the command of Mstislav the Bold and Mstislav III of Kiev. The battle was fought on the banks of the Kalka River (in present-day Donetsk Oblast, Ukraine) and ended in a Mongol victory.