Battle of the River Bug
1018 CE.
Shown on the map at 52.508°, 21.084°.
The Battle of the River Bug, sometimes known as the Battle of Volhynia, took place on 22–23 July 1018, in Red Ruthenia, near the Bug River and near Volhynia (Wołyń), between the forces of Bolesław I the Brave of Poland and Yaroslav the Wise of Kievan Rus, during the Bolesław's Kiev Expedition. Yaroslav was defeated by the Polish duke. It was part of the 1015–1019 Kievan war of succession following the death of Vladimir the Great in 1015. Boleslaw supported his son-in-law, Sviatopolk (known as Sviatopolk the Damned for his murder of his half-brothers Boris and Gleb), who was eventually defeated by Yaroslav. Both armies met on opposite banks of the river Bug. Yaroslav's forces took up positions with archers covering the crossing points; Bolesław took his time, allowing his army to rest, and started work on several makeshift bridges. The main battle occurred on 23 July.
Text from the Wikipedia article Battle of the River Bug, licensed CC BY-SA 4.0.