Verse 30. Was war - Not an invasive war with potent armies, which was forbidden, chap. xii, 24, and not revived 'till Abijam's reign, 2 Chron. xiii, 1-3, but a defensive war from those hostilities which by small parties and skirmishes they did to one another.
Verse 31. An Ammonitess - This is repeated as a thing very observable.