Map of the Byzantine-Arab conflict in Asia Minor in 837 and 838 AD, with the raid by Theophilos in Mesopotamia and the retaliatory campaign by Caliph Mu'tasim which culminated in the Sack of Amorium.
Own work using:

Geophysical map taken from from DEMIS Mapserver, which are public domain, otherwise self-made.
Main source on the course of the campaign: W. Treadgold, The Byzantine Revival, 780-842 (1988)
Cplakidas