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was severely weakened by civil war and dynastic rivalries. Dmitry took advantage of this lapse in Mongol authority to openly challenge the Tatars. While he kept the Khan's patent to collect taxes for all of Russia, Dmitry is also famous for leading the first Russian military victory over the Mongols. Mamai, a Mongol general and claimant to the throne, tried to punish Dmitry for attempting to increase his power. In 1378, Mamai sent a Mongol army, but it was defeated by Dmitry's forces in the Battle of Vozha River.

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