The Russian conquest Conquering of Siberia began Process_start in July 1580 when some 540 Cossacks under Yermak Timofeyevich invaded Attack the territory of the Voguls , subjects to Küçüm , the Khan of Siberia .

Following Motion_directional a series of Tatar raids Attack in retaliation against the Russian advance Cause_to_make_progress , Yermak 's forces prepared GetReady for a campaign to take Creating Qashliq , the Siberian capital .

After a three-day battle Hostile_encounter on the banks of the river Irtysh , Yermak was victorious against a combined Cause_to_amalgamate force of Küçüm Khan and six allied Tatar princes .

The forces of the Khan retreated Escaping , and Yermak entered Arriving Qashliq on 26 October .

He suddenly attacked Attack Yermak on 6 August 1584 in the dead Death of night and defeated Hostile_encounter most of his army .

The details are disputed Quarreling with Russian sources claiming Statement Yermak was wounded Bodily_harm and tried to escape Escaping by swimming Self_motion across the Wagay River which is a tributary of the Irtysh River , but drowned Killing under the weight of his own chainmail .

The remains Presence of Yermak 's forces under the command Control of Mescheryak retreated Escaping from Qashliq , destroying Destroying the city as they left Departing .