Numbers 21:18

The armies of Israel now begin to emerge out of the wilderness, and to come into a land inhabited, to enter upon action, and take possession of the frontiers of the land of promise. A glorious campaign this chapter gives us the history of, especially in the latter part of it. Here is, I. The defeat of Arad the Canaanite (Num 21:1-3). II. The chastisement of the people with fiery serpents for their murmurings, and the relief granted them upon their submission by a brazen serpent (Num 21:4-9). III. Several marches forward, and some occurrences by the way (Num 21:10-20). IV. The celebrated conquest of Sihon king of the Amorites (Num 21:21-32), and of Og king of Bashan (Num 21:33-35), and possession taken of their land.

21:18b-20 After moving north of the Arnon, the Hebrews left the wilderness on the eastern side of Moab and the recently conquered Amorite territory (see study note on 21:21-35). They turned westward toward the ridgeline that rises up from the Jordan Rift Valley, then traveled north to Pisgah Peak (see also 23:14; Deut 3:17, 27; 34:1, 5).