He struck them from Aroer until you come to Minnith, even twenty cities, and to Abelcheramim, with a very great slaughter. So the children of Ammon were subdued before the children of Israel.
Webb pointed out, in the helpful article quoted above, that Israel had done the same thing Jephthah did. This tendency to negotiate with God marked and marred her relationship with Yahweh during this period of her history.