When you reached this place, Sihon king of Heshbon and Og king of Bashan came out against us in battle, but we defeated them.
7. And when ye came unto this place. This, a third instance (of God’s goodness), because He had smitten the first enemies, who encountered them to impede their passage, and thus had already begun to bring them into a place of rest.
Now that Moses had largely repeated the commands which the people were to observe as their part of the covenant, and the promises and threatenings which God would make good (according as they behaved themselves) as part of the covenant, the whole is here summed up in a federal transaction.
Commenting on Deuteronomy 29:1-9
And when ye came unto this place,.... The borders of Moab, the wilderness before it, to which joined the plains they were now in; see Num 21:13, Sihon king of Heshbon, and Og king of Bashan, came out against us unto battle; not together, but one after the other, and that very quickly; as soon almost as they had fought with the one, and conquered...