He destroyed many nations and killed powerful kings,
Israel defeated them and took over the Amorite territory from the Arnon River gorge in the south to the Jabbok River gorge in the north. Beyond the Jabbok was the territory of the Ammonites, who were much stronger than Israel.
So the Israelites wiped out Og, his family, and his entire army--there were no survivors. Then Israel took over the land of Bashan.