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The Battle of the Unstrut River is said to have been fought in 531 CE near the river Unstrut when the king of Francia, Theuderic I decisively defeated the Thuringii army led by their king Hermanfrid. Thuringia was subjugated in 530 CE, soon after the battle.
Citations
Durant, 1950, p. 92.
References
Durant, Will. The Age of Faith: A History of Medieval Civilization from Constantine to Dante -- A.D. 325-1300. The Story of Civilization IV. New York: Simon and Schuster, 1950. ISBN978-0-9650007-5-8.