“Whoever comes to us with a sword will die by the sword. On this the Russian land stood and will stand” - these words of Alexander Nevsky are proven by our entire history. Russia had to go through many wars, many peoples and states tested the strength of the Russians, but Rus' survived. However, there are wars that had a greater impact on the formation of the national spirit, the memory of which has been preserved for centuries, but there are also forgotten battles, the memories of which have not been preserved in the people's memory. And yet, every battle of the past had its influence on our mentality, our statehood and our history. The book tells about the hundred most important battles in the history of Medieval Rus'.