2 Chronicles 18:28-32

28So the king of Israel and Jehoshaphat the king of Judah went up to Ramoth–gilead.

29And the king of Israel said unto Jehoshaphat, I will disguise myself, and will go to the battle; but put thou on thy robes. So the king of Israel disguised himself; and they went to the battle.

30Now the king of Syria had commanded the captains of the chariots that were with him, saying, Fight ye not with small or great, save only with the king of Israel.

31And it came to pass, when the captains of the chariots saw Jehoshaphat, that they said, It is the king of Israel. Therefore they compassed about him to fight: but Jehoshaphat cried out, And Yhwh helped him; and God moved them to depart from him.

32For it came to pass, that, when the captains of the chariots perceived that it was not the king of Israel, they turned back again from pursuing him.1