They turned and went up by the way of Bashan. The brevity of the narrative does not allow us to know who went upon this expedition, or why they went. It may have been only the detachment which had reconnoitered and taken Jaazer, and they may have found themselves threatened by the forces of Og, and so led on to further conquests beyond the Jabbok.
Og the king of Bashan. Og was himself of the aboriginal giant race which had left so many remnants, or at least so many memories, in these regions (see on Deuteronomy 2:10-12, Deuteronomy 2:20-23; Joshua 12:4; Joshua 13:12); but he is classed with Sihon as a king of the Amorites (Joshua 2:10) because his people were chiefly at least of that race.
Bashan itself comprised the plain now known as Jaulan and Haulan beyond the Jarmuk (now Mandhur), the largest affluent of the Jordan, which joins it a few miles below the lake of Tiberias. The kingdom of Og, however, extended over the northern and larger part of Gilead, a much more fertile territory than Bashan proper (see on Deuteronomy 3:1-17).
At Edrei. Probably the modern Edhra'ah, or Der'a, situate on a branch of the Jarmuk, some twenty-four miles from Bozrah. The ancient city lies buried beneath the modern village, and was built, like the other cities of Bashan, in the most massive style of architecture.
The cities of Og were so strong that the Israelites could not have dispossessed him by any might of their own if he had abode behind his walls. Either confidence in his warlike prowess or some more mysterious cause (see on Joshua 24:12) impelled him to leave his fortifications, and give battle to the Israelites to his own utter defeat.