Ural Cossack Host
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The Ural Cossack Host was a cossack host formed from the Ural Cossacks -- those cossacks settled by the Ural River. Their alternative name, Yaik Cossacks, comes from the old name of the river.
Yaik Cossacks were the driving force in the rebellion led by Yemelyan Pugachev in 1773-1774.