So Sihon and his whole army came out for battle against us at Jahaz.
God having tried the self-denial of his people in forbidding them to meddle with the Moabites and Ammonites, and they having quietly passed by those rich countries, and, though superior in number, not made any attack upon them, here he recompenses them for their obedience by giving them possession of the country of Sihon king of the Amorites.
Commenting on Deuteronomy 2:24-37
Then Sihon came out against us,.... Perceiving they were upon their march towards his land or into it, he gathered all his people and went out of Heshbon their capital city, where he resided: he and all his people, to fight at Jahaz; a city which he had taken from the king of Moab, and which in later times, after the captivity of the ten...
Deu 2:32-33 Defeat of Sihon, as already described in the main in Num 21:23-26. The war was a war of extermination, in which all the towns were laid under the ban (see Lev 27:29), i.e., the whole of the population of men, women, and children were put to death, and only the flocks and herds and material possessions were taken by the conquerors as prey.
Commenting on Deuteronomy 2:32-33