The Battle of Cologne was fought near the city of Köln (English: Cologne) (now part of Germany) in the year 716. The battle is known chiefly as the first battle of Charles Martel's command and is the only defeat of his life.
Outside of Cologne, held by Plectrude, an ill-prepared Charles Martel was defeated by Ratbod, and forced to flee to the mountains of the Eifel. Cologne fell after a short siege to the King Chilperic and the Neustrians. The Neustrians compelled Plectrude to acknowledge as king Chilperic, the son of Childeric II, having taken this Merovingian from the seclusion of the cloister, where he lived the name of Daniel.
Once in the mountains of the Eifel, Charles began to rally his supporters, and in short order was ready to do battle. He fell on the army of Chilperic II, and at the Battle of Amblève near Ameland as they returned triumphantly from Cologne, and crushed their army. He remained undefeated thereafter for the next twenty-five years.