Coalition of Rus' Principalities against the Mongols

Timeline

1. 1223Kyiv · Kievan Rus'The defeated Cuman khagan Köten appealed to the Rus' princes, reporting the appearance of a powerful enemy in the east. Grand Prince Mstislav of Kyiv convened the principalities to deliberate and decided to send troops to aid the Cumans and drive out the invaders.
2. 1223Lower Dnieper · Kievan Rus'The principalities of Kyiv, Chernigov, Galicia-Volhynia, Smolensk, and others dispatched troops, forming a coalition of about 80,000 men. Each prince commanded his own contingent, lacking unified strategic command, agreeing only to jointly pursue the Mongol army.
3. 1223Bank of the Kalka River · UkraineThe coalition was annihilated by the Mongol army at the Battle of the Kalka River, with most princes killed in battle or captured and executed. The anti-Mongol effort ended in a crushing defeat; the Rus' principalities were unable to organize large-scale resistance in the short term, while the Mongol army continued westward.