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 tribes, came into their hands again, Isaiah 15:4; see Gill on Numbers 21:21.

Defeat of Sihon, as already described in the main in Numbers 21:23-26. The war was a war of extermination, in which all the towns were laid under the ban (see Leviticus 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.

Then Sihon came out against us, he and all his people, to fight at Jahaz.

2:24-37 God tried his people, by forbidding them to meddle with the rich countries of Moab and Ammon. He gives them possession of the country of the Amorites. If we keep from what God forbids, we shall not lose by our obedience. The earth is the Lord's and the fulness thereof; and he gives it to whom he pleases; but when there is no express direction, none can plead his grant for such proceedings. Though God assured the Israelites that the land should be their own, yet they must contend with the enemy. What God gives we must endeavour to get. What a new world did Israel now come into! Much more joyful will the change be, which holy souls will experience, when they remove out of the wilderness of this world to the better country, that is, the heavenly, to the city that has foundations. Let us, by reflecting upon God's dealings with his people Israel, be led to meditate upon our years spent in vanity, through our transgressions. But happy are those whom Jesus has delivered from the wrath to come. To whom he hath given the earnest of his Spirit in their hearts. Their inheritance cannot be affected by revolutions of kingdoms, or changes in earthly possessions.