Sparrow Hills
Ogarev was a fellow-exile and collaborator of Alexander Herzen on "Kolokol", a newspaper printed in England and smuggled into Russia. In the summer of 1827, during a walk in the Sparrow Hills above Moscow, Herzen and Ogarev made an oath not to rest until their country was free; the oath reportedly sustained them and their friends throughout many crises of their lives at home and abroad and was described in E. H. Carr's "The Romantic Exiles".