Numbers 21:23

And Sihon would not suffer Israel to pass through his border,.... Because he could not trust them, and confide in the promises they made, and thought it not safe to let such a body of people into any part of his dominions, Judges 11:20 and chiefly because his heart was hardened by the Lord, that he might be delivered into the hands of Israel, as was determined, Deuteronomy 2:30:

but Sihon gathered all his people together; all that were able to bear arms out of his cities, and which made no doubt a very numerous and powerful army; but then these being defeated, as they were, it became more easy to the Israelites to take their cities, where there were none left but women and children:

and went out against Israel into the wilderness; the wilderness of Kedemoth; not content to reject a peaceable message, he went out in an hostile manner against Israel, even out of his own dominions; so that he was the aggressor and unprovoked, which made his ruin appear the more just, and the children of Israel to have a better claim to his country conquered by them:

and he came to Jahaz; a frontier town in the land of Moab, see

Isaiah 15:4 and which, according to Bunting p, was sixteen miles from Abarim:

and fought against Israel; at the above place, where they had a pitched battle.

p Travels of the Patriarchs, p. 83.