1 Kings 20:23-26

23Meanwhile, the servants of the king of Aram said to him, “Their gods are gods of the hills. That is why they prevailed over us. Instead, we should fight them on the plains; surely then we will prevail. 24So do this: Dismiss all the kings from their positions and replace them with other officers. 25And you must raise an army like the one you have lost—horse for horse and chariot for chariot—so we can fight the Israelites on the plain, where we will surely prevail.”

And the king approved their plan and acted accordingly.

26In the spring, Ben-hadad mobilized the Arameans and went up to Aphek to fight against Israel.