On 4 December Russian forces attacked the Tatars and drove them into the ice fortress, but were defeated trying to take it at once. Princes Pyotr Kuzminsky and Semyon Volynets, who broke into the fortification on the heels of the retreating Tatars, were killed. According to the Russian chronicle, the losses of the Tatars were also heavy, some unnamed Ulug Mohammed's son-in-law was even killed there.