Instead of returning to face these raids, Thomas launched a large-scale invasion of his own against Abbasid territory in spring 821, either in Syria (according to Bury and others) or in Arab-held Armenia (according to Treadgold).
Daripada kembali menghadapi serangan-serangan ini, Tomaž melancarkan invasi besar-besaran terhadap wilayahnya sendiri di wilayah Abbasiyah pada musim semi tahun 821, baik di Suriah (menurut Bury dan lain-lain) atau di Armenia yang dipegang Arab (menurut Treadgold).