Albert Barnes Commentary Deuteronomy 1:4

"after he had smitten Sihon the king of the Amorites, who dwelt in Heshbon, and Og the king of Bashan, who dwelt in Ashtaroth, at Edrei." — Deuteronomy 1:4 (ASV)

Astaroth - Regarding this place, compare Genesis 14:5 and the note.

In Edrei - These words should, to make the meaning clear, follow "slain." The battle in which Sihon and Og were defeated took place at Edrei.