many contemporary sources mention this battle, like the "chronicon" of regino of prüm, the "annales fuldenses", the "chronicon sagornini" of john the deacon, "catalogus abbatum nonantulorum", etc. the most important source is "antapodosis, seu rerum per europam gestarum", written by liutprand of cremona, which gives the most detailed description of the events which led to the battle and battle itself.