 At the same time, the Rus'attempted to trap the Mongols. The princes of Galich and Volhynia transported their armies south down the river, while the princes of Kiev and Chernigov advanced north up the river, and the army of Kursk advanced from the front. At the same time, the Cumans attempted to attack the Mongol army's rear. When Jebe learned of this, he sent 10 envoys to the Prince of Kiev. The envoys stated that the Mongols had no feud with the Rus and were only attacking the Cumans; they added that the Mongols were marching east, away from the Rus' cities. Mstislav of Kiev had the envoys executed, and the Mongols responded by sending another set of ambassadors, who declared war.
