Battle of the Ries
The battle of the Ries of 13 May 841 was a major engagement of the Carolingian civil war of 840–843. King Louis the German surprised and routed the army of Count Adalbert of Metz on the banks of the river Wörnitz in the Ries. Adalbert, who had been charged by the emperor Lothar I with preventing Louis from breaking out of Bavaria, was killed in the fighting. The victory allowed Louis to join up with King Charles the Bald and defeat Lothar in the battle of Fontenoy-en-Puisaye in late June.