The work made the first attempt in historiography to create a set of trips of the Russian military to Iran in the 1830s - 1850s. The general tasks set by the highest military authorities of Russia before them were identified, the tasks and activities of each of the expeditions were analyzed. Particular attention is paid to what exactly the officers were doing in Iran, what were the results of their work. The book will be of interest to scientists, as well as to everyone interested in the military history of Russia and Iran.