Pugachev's Rebellion
Pugachev's Rebellion (Peasants' War 1773-75, Cossack Rebellion) of 1773-75 was the principal revolt in a series of popular rebellions that took place in the Russian Empire after Catherine II seized power in 1762. It began as an organized insurrection of Yaik Cossacks headed by Yemelyan Pugachev, a disaffected ex-lieutenant of the Imperial Russian Army, against a background of profound peasant unrest and war with the Ottoman Empire. After initial success, Pugachev assumed leadership of an alternative government in the name of the assassinated Tsar Peter III and proclaimed an end to serfdom. This organized leadership presented a challenge to the imperial administration of Catherine II.
Nağaybäk
In 1773 Nagaybak Fort was caught in the way of Yemelyan Pugachev's rebellion. Loyal cossacks and troops, headed by captain Rushinsky, fled to Menzelinsk; most of the remaining soldiers joined the rebellion and participated in the siege of Ufa. Pugachev installed a "newly baptized Persian" by the name of Tornov, as the ataman of Nagaybak. In January 1774 a small government company pushed the rebels out of Nagaybak Fort, but Tornov returned in strength and regained control over the fort. Two weeks later a whole corps of government troops crushed the rebellion. The fort became a base for punitive expeditions against the remains of Pugachev's army.