Finding themselves on an unknown planet in company with the peasants of Ancient Rus', Roman legionnaires, Carthaginians and English pirates, an American regiment from the Civil War led by Colonel Andrew Lawrence Keene leads the joint struggle of people with the owners of this planet - bloodthirsty creatures three meters tall, for whom All people are cattle, suitable only for food. Russian troops defeat a horde of Tugar nomads, but then Rus' is invaded by even more countless hordes of Merks, who, due to the betrayal of two Yankees, take possession of the secrets of making modern weapons. Total war is fought on land, sea and air. Russians have to leave their land. A decisive battle awaits on the last frontier, on the border with Rome. In case of defeat, people have no chance of salvation.