Goodly castles - Rather, both here and in Genesis 25:16, hamlets. The word is derived from a word טוּר ṭûr,) signifying "a row" or "range" (compare Ezekiel 46:23); and probably indicates those collections of rude dwellings, made of stones piled one on another and covered with tent-cloths, which are used by the Arabs to this day; and which are frequently mentioned as douars in narratives of the French campaigns in Algeria. These dwellings would be formed usually in a circle. See the word "Hazeroth," in Numbers 11:35.

And they burnt all their cities wherein they dwelt, &c. ) So far as they went into the country, which, perhaps, might not be the whole land of Midian:

and all their goodly castles with fire; which were either the palaces of their princes and nobles, or such like great personages; or they were fortified places, for the security of their cities and country: the Targums of Onkelos and Jonathan interpret them of their houses of worship, their temples, and their altars.

And they burnt all their cities wherein they dwelt, and all their goodly castles, with fire.

31:7-12 The Israelites slew the Kings of Midian. They slew Balaam. God's overruling providence brought him thither, and their just vengeance found him. Had he himself rightly believed what he had said of the happy state of Israel, he would not have thus herded with the enemies of Israel. The Midianites' wicked wiles were Balaam's projects: it was just that he should perish with them, Ho 4:5. They took the women and children captives. They burnt their cities and castles, and returned to the camp.