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 god of the valleys, I will deliver this vast army into your hands, and you will know that I am the LORD.'" (1 Kings 20:28)
The king of Aram warred with the king of Israel, but he and his armies were defeated because God gave Israel victory. The Arameans investigated the cause of their defeat and came to the following conclusion:
"Their gods are gods of the hills. That is why they were too strong for us. But if we fight them on the plains, surely we will be stronger than they. (1 Kings 20:23)
God heard their talk about calling him "gods of the hills", though they did it out of ignorance, yet God proved to them that he is not only God of the hills but God of the plains too; in fact he is God Almighty; omnipotent, omniscient and omnipresent.
God sent a prophet to give the king of Israel the promise that we read in the title verse here. Compared to the vast Aramean army, the Israelite army was very small.
When the Israelites were also mustered and given provisions, they marched out to meet them. The Israelites camped opposite them like two small flocks of goats, while the Arameans covered the countryside. (1 Kings 20:27)
Yet the Lord fought for Israel and defeated the Arameans.
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, where the wall collapsed on twenty-seven thousand of them.
The enemy that you face today may be stronger than you but can never match the strength of Immanuel- Jesus Christ who is with you at all times. Remember, the battle is the Lord's and he will fight for you as he fought for Israel. The victory is your's so PRAISE THE LORD.