The existence Presence of this battle Hostile_encounter is known due Causation to several different chronicles , including the Annales Fuldenses and the `` Anglo-Saxon Chronicle '' .

The Annales Fuldenses are royal chronicles of the East Frankish kingdom covering Filling the years 714-901 AD .

Efforts to verify Check the report Reporting of the battle Hostile_encounter from the Annales Fuldenses , specifically the huge loss of life on the Viking side , have been hindered Hindering by the lack of archaeological excavations in Belgium .