The Battle of the Stuhna River (sometimes written as Stugna River; on 26 May 1093) was fought between the princes of Kievan Rus', Sviatopolk II of Kiev, Vladimir II Monomakh of Chernigov, and Rostislav Vsevolodovich of Pereyaslavl against the nomadic Cumans. The Kievan forces were defeated.
Background
The Cumans raided Rus' soon after the death of Vsevolod and sought peace with the new great prince, Sviatopolk. However, Sviatopolk incarcerated the Cumans' ambassadors, and the Cumans came in force to attack Kiev. Facing an enemy army of eight thousand, Sviatopolk took the advice of counsel and called for help from Vladimir Monomakh, prince of Chernigov. Vladimir came with his troops and also called upon his only brother, Rostislav of Pereyaslavl.
thumb|250px|Princes of Rus' deliberate their actions against the Cumans. 1910 painting
Battle
A union of Kievan princes against Cumans was achieved, and Sviatopolk released the ambassadors of the Cumans. The troops of the three princes joined and set out for the city of Trypillia. Approaching the river Stuhna, the princes were undecided, so they stopped to have a council, while the Cumans were across the river facing them. Vladimir, whose wife was a Cuman princess, continued to demand that they sue for peace, but the Kievan troops wanted battle. They crossed the river and met the Cumans in a valley at the rampart of Trepol'. Sviatopolk deployed on the right, Rostislav in the center, and Vladimir on the left.