The fundamental work of the outstanding military historian, General of the Russian Army V. A. Potto covers the period of the Caucasian War from the beginning of the 16th century to 1831. For many years, in different places, the author collected scattered documents and materials with one goal - to extract from oblivion and combine them into one coherent a narrative of dramatic and heroic events, which, developing and intensifying, determined the very special role of the Caucasian War in our history. The fourth volume includes descriptions of the events of the Turkish War of 1828-1829.