2 Kings 7:6
For the Lord had made the host of the Syrians to hear a noise of chariots, and a noise of horses, even the noise of a great host: and they said one to another, Lo, the king of Israel hath hired against us the kings of the Hittites, and the kings of the Egyptians, to come upon us.
The Lord caused the Syrian army to hear the sound of chariots and the sound of horses, even the sound of a great host approaching. The Syrians took this to mean that the king of Israel had hired against them the kings of the Hittites and the kings of the Egyptians to come upon them. Fear from that belief drove them to flee from their camp and to abandon its supplies behind them.