The man of God came up and told the king of Israel, "This is what the LORD says: 'Because the Arameans think the LORD is a god of the hills and not a god1 of the valleys, I will deliver this vast army into your hands, and you will know2 that I am the LORD.' "
References for 1 Kings 20:28
For seven days they camped opposite each other, and on the seventh day the battle was joined. The Israelites inflicted a hundred thousand casualties on the Aramean foot soldiers in one day.
The rest of them escaped to the city of Aphek,3 where the wall collapsed4 on twenty-seven thousand of them. And Ben-Hadad fled to the city and hid5 in an inner room.
References for 1 Kings 20:30