Evgeniy Andreevich Razin (Neklepaev) is a military historian, major general, for many years he was a teacher at the Academy. Frunze. The book about the battles of Ancient Rus' shows the largest battles of this period, ranging from the first campaigns of the Russian princes to the famous battles of Alexander Nevsky. Unlike many researchers who simply retell the relevant military campaigns, E.A. Razin examines the war from different angles, paying special attention to the politics of the ancient Russian principalities, the reasons for hostilities, and the peculiarities of waging war during this period. It is no coincidence that his works have become classics in the history of military affairs and are still in demand by both specialists and readers interested in this topic.