Cities of the plain Opposed to the cities of the mountain or the valley. All the kingdom of Sihon A great part of it; in which sense we read of all Judea, and all the region round about Jordan, Matthew 3:5; and all Galilee, Matthew 4:23. Whom Moses smote Not in the same time or battle, as appears by comparing Numbers 21:23-24, with Numbers 31:8, but in the same manner. Dukes of Sihon But how could they be so, when they were kings of Midian? Numbers 31:8. There were divers petty kings in those parts, who were subject to other kings, and such these were, but are here called dukes or princes of Sihon, because they were subject and tributaries to him, and therefore did one way or other assist Sihon in this war, though they were not killed at this time.
Related Commentaries of Joshua 13:21
Joshua 13:21
21 And all the cities of the plain, and all the kingdom of Sihon king of the Amorites, which reigned in Heshbon, whom Moses smote with the princes of Midian, Evi, and Rekem, and Zur, and Hur, and Reba, which were dukes of Sihon, dwelling in the country.