[6] He only managed to remain in power for eight days and then had to flee to Tmutarakan upon hearing the news of Vsevolod's return.

[7] Boris and Oleg allied themselves with the Cumans and attacked Vsevolod on the Sozh River, defeating his army in a bloody battle and capturing Chernigov on 25 August 1078.

[10] Boris and Oleg had already left the city by the time Vsevolod and Izyaslav approached it, but the citizens of Chernigov closed the gates and prepared for the siege.

[10] The attackers burned the outer parts of the city and wanted to proceed further, but received the news on Oleg and Boris coming to Chernigov's rescue.

[11] Boris died in a fierce battle "at a place near a village on the meadow of Nezhata"[12] on 3 October, according to the Primary Chronicle.