This essay is the full account, the first in English, of the correspondence between the Russian general, Paul Tsitsianov, and the governor of the khanate of Ganjeh, Javād Khān Qajar. Drawing on contemporary Russian and Iranian records, it includes a daily account of Tsitsianov’s preparation, siege and the storming of the fortress of Ganjeh, which led to the First Russo-Iranian War (1804–13). The essay further includes two special maps—the first is the map of the South Caucasus in 1800 and the route of the invasion; while the second is based on a rare Russian military map that reveals the siege and storming of the fortress.