The Battle of the Sit River took place on 4 March 1238 between the Mongol hordes of Batu Khan and the Suzdalians under Grand Prince Yuri II of Vladimir-Suzdal during the Mongol invasion of Kievan Rus'.

It was fought in the northern part of the present-day Sonkovsky District of Tver Oblast of Russia, close to the selo of Bozhonka.

After the Mongols sacked his capital of Vladimir on the Klyazma, Yuri fled across the Volga northward, to Yaroslavl, where he hastily mustered an army.

[2] He and his brothers then turned back toward Vladimir in hopes of relieving the city before the Mongols took it, but they were too late.

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