The Battle Hostile_encounter of Anzen or Dazimon was fought Hostile_encounter on 22 July 838 at Anzen or Dazimon ( now Dazmana ( Akçatarla ) , Turkey ) between the Byzantine Empire and the forces of the Abbasid Caliphate .

The Battle Hostile_encounter of Anzen or Dazimon was fought Hostile_encounter on 22 July 838 at Anzen or Dazimon ( now Dazmana ( Akçatarla ) , Turkey ) between the Byzantine Empire and the forces of the Abbasid Caliphate .

The northeastern army defeated Conquering the Byzantine forces under Theophilos at Anzen , allowing Preventing_or_letting the Abbasids to penetrate deep into Byzantine-held Asia Minor and converge upon Ancyra , which they found Know abandoned GiveUp .