The beginning of the story is about how God granted victory to the Emperor Grand Duke Dmitry Ivanovich after Don over the filthy Mamai and how the prayers of the Holy Mother of God and Russian miracle workers Orthodox Christianity - God elevated the Russian land, and shameless gods Hagarians.

The prince of the eastern country Mamai, a pagan and an evil persecutor of Christians, decides to go to Russian land at the instigation of the devil. Prince Oleg Ryazansky, the protege of Mamaia, and Prince Olgerd of Lithuania, who also swore allegiance to Mamaia, send out ambassadors with rich gifts to Mamaia and declare their readiness to join his army, for they hope that Mamaia will surrender Olgerda to Moscow and the surrounding cities, and Oleg Ryazan Kolomna, Vladimir and Murom. Oleg and Olgerd are confident that Prince Dmitry Ivanovich of Moscow will not dare to speak out against Mamaia and will flee from Moscow, leaving his land to the enemy. Hearing that Mamai with countless troops is approaching Russia, Prince Dmitry sends to Borovsk for his brother, Prince Vladimir Andreyevich, as well as for all Russian princes, governors and servants. Prince Dmitry tells Metropolitan Cyprian that he did not commit anything to Mamai and paid tribute to him, as it should have been by agreement and even beyond that. Cyprian advises the prince to humble himself and send Mamai as much gold as there is, and if Mamai goes to Russia after the war, he will be struck by the Lord himself, who opposes the bold and helps the humble.

Prince Dmitry obeys the advice and sends to meet Mamay Zakhary Tyutchev, giving him a lot of gold. However, Zachary, having reached Ryazan, discovers that the princes Oleg Ryazansky and Olgerd of Lithuania have joined Mamaia and secretly sends a messenger to Dmitry with this message. The prince reports everything to Metropolitan Cyprian and calls for soldiers from all over Russian land to come to the service so that they arrive in Kolomna for the Assumption of the Holy Virgin. Prince Dmitry himself, along with his brother and all Russian princes, goes to the life-giving Trinity, to his spiritual father the Rev. Elder Sergius. He sprinkles it with water, consecrated with the relics of the holy martyrs Flora and Laurus, and tells him so that no one will hear that the prince will defeat the enemy. At the request of the prince, hegumen Sergius gives him two warriors from the monastic brotherhood - Alexander Peresvet and Andrey Oslyabyu.

The prince returns to Moscow and, presenting himself to Metropolitan Cyprian, secretly informs him that Elder Sergius predicted his victory over the enemy and blessed the entire Orthodox army. Having blessed the prince on a campaign against the Tatars, the metropolitan sends a blessed cathedral with crosses, holy icons and blessed water to the Frolovsky, Nikolsky and Konstantino-Eleninsky gates so that every soldier leaves them blessed and sprinkled with holy water.

Having reached Kolomna, the prince distributes the regiments, appoints a governor and, taking a blessing from the Archbishop of Kolomna, Gerontius, crosses the Oka River with the whole army, in prayer calling for help from his relatives, the holy martyrs Boris and Gleb. The princes Oleg Ryazansky and Olgerd of Lithuania, having learned that Prince Dmitry with a large army is going to the Don against Mamaia, begin to doubt the success of the campaign of Mamaia: they are in no hurry to join his army and are waiting for the outcome of the battle. At the same time, princes Andrei Polotsky and Dmitry Bryansky, Olgerdovich, unloved by their father because of their stepmother and who received holy baptism, learn that the Tatars go to Russia and decide to join the Orthodox army of Prince Dmitry.

The prince, rejoiced, sends to Moscow Metropolitan Kiprian the news that the Olgerdovichs came to him with their troops and left their father. Prince Dmitry consults with his brother Vladimir and with the Olgerdovichi whether he should cross the Don or not. Those convince him that if he wants a solid army, then it is necessary to cross the Don, because then no one will have thoughts of retreat. The Russian army crosses the Don, and scouts report that the Tatars are already close and know that Prince Dmitry has gathered great forces against them. The prince rides on shelves with governors and calls on the soldiers to stand up for Russia and the Orthodox faith, not sparing life.

On the night of the luminous feast of the Nativity of the Blessed Virgin Mary, Thomas Katsibey, the robber whom Prince Dmitry distinguished for his courage and placed on the Churove River for protection from the Tatars, is given a marvelous vision. God, wanting to correct Thomas, shows him how a large cloud moves from the east, as if some troops are going to the west, and from the south two young men come in bright scarlet, with shining faces and hold sharp swords in their hands. The youths threateningly demand an answer from the leaders of the army, asking them who allowed them to attack their fatherland, and they all are cut with swords, so that not a single enemy is saved. In the morning, Thomas speaks of his vision to the prince and since then has become prudent and believes in God.

Prince Dmitry sends his brother, Prince Vladimir, together with Dmitry Volynets up the Don to the oak forest, so that they hide there with their regiments. And on the eighth day of September, on the feast of the Nativity of the Blessed Virgin Mary, at dawn, both troops, Russian and Tatar, confront each other on the Kulikovo field. The earth groans terribly, predicting a thunderstorm, and the Kulikovo field bends, and the rivers protrude from the banks, for there have never been such a myriad of people in that place. The messenger from the Monk Elder Sergius gives the prince letters of blessing and a loaf of the Holy Mother of God, and the prince loudly offers a prayer to the Holy Trinity and the Mother of God and asks for their help and intercession. Then the prince, contrary to all persuasion, mounts his horse and stands in front of his warriors to fight in the forefront. At three o'clock in the afternoon.

An evil Pecheneg of five fathoms leaves the Tatar army, and on the Russian side, at the command of Hegumen Sergius, a monk Alexander Peresvet comes out, armed with a schema. They rush at each other, hit with spears and both fall dead from the horses. Prince Dmitry calls on his warriors to show their courage, and both troops converge and the battle begins.

At the seventh hour the Tatars begin to prevail. Prince Vladimir, hiding with his warriors in the oak forest, is trying to help his brother out, but Dmitry Volynets holds him back, saying that it is not the time. When the eighth hour arrives, their fresh forces attack the Tatars, and they do not withstand the onslaught and flee the battlefield. Mamai calls his gods: Perun, Salavat, Rakli, Khors and his accomplice Mohammed, but there is no help from them. He runs away, and he manages to escape from the chase.

Thus, Prince Dmitry defeated the Tatars by the grace of God and the mother of God and with the help of Saints Boris and Gleb, whom Thomas Katsibey saw. Prince Dmitry is found in an oak-tree, beaten and wounded, and he orders the soldiers to bury their comrades so that Christian bodies do not become the prey of wild animals.

The Russian army stands on the battlefield for eight days, while the soldiers bury their neighbors. But Mamai returns to his land, collects the remaining forces and wants to go to Russia again by war, but finds out that Tsar Tokhtamysh from the east goes to him. Tokhtamysh defeats Mamaia’s army on Kalka, Mamaia flees to Kafa, withholding his name, but he is identified and killed. Olgerd, having heard of the glorious victory of Prince Dmitry, returns with shame to his possessions. Oleg Ryazansky, fearing that Prince Dmitry would send his army to him, escapes from his estate, and when the Ryazans brow the Grand Duke, he puts his governors in Ryazan.