From the late 18th century, Russia actively started to increase its enroachments into Iranian and Turkish territory to the south. Following the annexation of eastern Georgia in 1801, Russia was now keen to conquer the rest of the Iranian possessions in the Caucasus. Russian expansion into the South Caucasus met particularly strong opposition in Ganja. In 1804, the Russians, led by General Pavel Tsitsianov, invaded and sacked Ganja, sparking the Russo-Persian War of 1804–1813. Some western sources assert that "the capture of the city was followed by a massacre of up to 3,000 inhabitants of Ganja by the Russians". They also claim that "500 of them were slaughtered in a mosque where they had taken refuge, after an Armenian told the Russian soldiers that there might have been "Daghestani robbers" among them".