Siege of Asselt
882 CE.
Shown on the map at 51.194°, 5.987°.
The siege of Asselt was a Frankish siege of the Viking camp at Ascloha (Asselt) in the Meuse valley in the year 882. Though the Vikings were not forced by arms to abandon their camp, they were compelled to come to terms whereby their leader, Godfrid, was converted to Christianity.
Text from the Wikipedia article Siege of Asselt, licensed CC BY-SA 4.0.