Grand Duke Dmitry Ivanovich and a duke Dmitry Bobrok on the night before the Battle of Kulikovo. Illustration for The Tale of the Mamaev Battle. late 16th century manuscript. Kulikov Battle ( Mamayevo or Don Battle ) - a major battle between the united Russian army led by the Moscow Grand Duke Dmitry Donskoy and the army of the Temnik and Beklarbek of the Mamai Golden Horde , which took place on September 8, 1380 in the area south of the confluence of the Nepryadva River into the Don , on Kulikovo field (southeast of the Tula region ). The decisive victory of the Russian troops in the Battle of Kulikovo was an important step towards the restoration of the unity of Russia and the future overthrow of the Golden Horde