Principality of Chernigov
In 1362 or 1363, Algirdas marched between lower Dnieper and Southern Bug. First, Algirdas captured remaining territories of the Principality of Chernigov – the bulk of the territory, including the capital in Bryansk, fell under Lithuanian control around 1357–1358. The Lithuanians then attacked Korshev (Коршов), an unidentified fortress located in the upper reaches of the Bystraya Sosna River, tributary of the Don River. It is believed that Algirdas further conquered territories of the former Principality of Pereslavl. The area belonged to Crimean ulus which was engaged in a campaign against New Sarai and could not organize effective resistance. In autumn, the Lithuanian army moved west and crossed the Dnieper River towards Podolia. Three Tatar beys of Podolia gathered an army to resist the invasion. It is believed that the armies met at present-day Torhovytsia (). At the time the town was known as Yabgu in Turkic, or viceroy, regent town, and Sinie Vody in Russian, or Blue Waters.