“So the king of Israel and King Jehoshaphat of Judah went up to Ramoth-gilead. The king of Israel said to King Jehoshaphat. ‘I will disguise myself and go into battle, but you wear your robes.’ So the king of Israel disguised himself and went into battle. Now the king of Aram had commanded the captains of his chariots. ‘Fight with no one small or great, but only with the king of Israel.’ When the captains of the chariots saw King Jehoshaphat, they said. ‘It is the king of Israel.’ So they turned to fight against him. However King Jehoshaphat cried out. Yahweh helped him. God drew them away from him. When the captains of the chariots saw that it was not the king of Israel, they turned back from pursuing him.”
Once again, this is almost word for word from 1 Kings, chapter 22. King Ahab and King Jehoshaphat went out together to do battle with the Arameans at Ramoth-gilead on the east side of the Jordan River. King Ahab must have expected something because he disguised himself and sent King Jehoshaphat with full robes into battle. In fact, the king of the Arameans had told his captains to kill King Ahab and not anyone else. Obviously the Arameans saw King Jehoshaphat with all his royal robes so that they thought that he was King Ahab. They started to fight against him until King Jehoshaphat cried out to go to battle. Here the biblical author says that Yahweh helped him to draw the Arameans away from him. Then they realized that is was not King Ahab and stopped pursuing him.