en_tn_condensed/num/21/28.md

A fire blazed from Heshbon, a flame from the city of Sihon

"King Sihon led a strong army from the city of Heshbon". These two phrases mean basically the same thing and emphasize that destruction will begin at Heshbon. The fire refers to a destroying army.

devoured Ar of Moab

"destroyed the town of Ar in the land of Moab"