The book tells about an outstanding event in the history of Ancient Russia - the battle of the Novgorod army led by Prince Alexander Yaroslavich with the Swedes who invaded Russia. The story is conducted on a wide historical background, the life of ancient Novgorod, Russian military art, the crusading aspirations of the Swedish feudal lords, a joint rebuff to the aggressors from the Slavs inhabiting the Prievsky lands are shown.