Northeastern Rus was attacked by the Mongol-Tatar armies in the winter of 1238. Pereslavl struggled against the attack for five days, losing most of its population. Rostov and Uglich both fell without a fight. Grand Prince Yuri II of Vladimir was killed, along with his nephews, princes of Rostov and Yaroslavl, in the Battle of the Sit River in the northern part of the region. As a result of the invasion, the Vladimir-Suzdal domain was obliged to pay tribute to the conquerors and submit to their political will.