In the early nineteenth century a plague struck the north Caucasus which lasted until the 1830s. It is estimated that Kabardia lost 90% of its population, falling from 200,000 in 1790 to 30,000 in 1830. In 1804 there was a general uprising all over the north Caucasus. The Russians won at least three battles mainly because of their artillery. One involved 13000 men on both sides and another involved 7000 Kabardians. Around 1810 Russia destroyed 200 villages. In 1822 new forts were built on the North Caucasus Line. In the 1820s Yermolov led a campaign which is said to have completely depopulated Lesser Kabardia. After about 1830 the Kabardians had been subdued by plague and war and the Russians turned their attention to the Murid War in the east and the Russo-Circassian War in the west. For more on the conquest see North Caucasus line.