The book tells about the ancient Russian city at the mouth of Sula, mentioned in the annals under the name Warrior. Founded in the second half of the 10th century. as a fortress on the southern borders of Russia, Warrior for about three centuries protected Russian lands from attacks by nomads. It was a prominent economic and cultural center. A special place was occupied by Warrior in foreign trade. Here was a fortified harbor, from where trade caravans went to the Black Sea. The warrior has undergone the fate of many other Old Russian cities. It was destroyed by the Tatars. Now its remains have covered the waters of the Kremenchug Sea. Before flooding, the military settlement was investigated by archaeologists. The authors of the monograph, based on the materials received, reproduce the bright pages of the life of the ancient city.