Prüm Abbey
The course of the battle is described in Widukind of Corvey's chronicle "Rerum gestarum Saxonicarum" lib. III c. LIII-LV and, in less detail, in Thietmar of Merseburg's "Chronicon" lib. II.12. Short mentions of the battle are recorded in the respective paragraphs about the year 955 in the continuation of the annals of Prüm Abbey and the annals of St. Gallen Abbey.