The Russians enforced taxation of natives through collection of yasak in sable furs and regularly trespassed their self-assumed rights; the natives evaded extortion by resettling to remote areas. Twice, in 1668 (Forsyth: 1666-1667) and 1679, the Lamuts openly revolted and besieged Zashiversk, but the colonists prevailed and fortified the settlement with a wooden stockade, the only one of its kind on the Indigirka. The Lamuts were dispersed with fortress guns, but successfully destroyed a Russian caravan on the way from Yana River to Zashiversk. Their active resistance continued until 1692, by 1700 the Lamuts and Yukagirs were firmly pressed into submission and ended their own fighting among native clans.