What does 2 Chronicles 18:28 mean?

The king of Israel said, “Take Micaiah, and carry him back to Amon the governor of the city, and to Joash the king’s son;

and say, ‘Thus says the king, “Put this fellow in the prison, and feed him with bread of affliction and with water of affliction, until I return in peace.”’”

Micaiah said, “If you return at all in peace, Yahweh has not spoken by me.” He said, “Listen, you people, all of you!”

The king of Israel said to Jehoshaphat, “I will disguise myself, and go into the battle; but you put on your robes.” So the king of Israel disguised himself; and they went into the battle.

Now the king of Syria had commanded the captains of his chariots, saying, “Don’t fight with small nor great, except only with the king of Israel.”

When the captains of the chariots saw Jehoshaphat, they said, “It is the king of Israel!” Therefore they turned around to fight against him. But Jehoshaphat cried out, and Yahweh helped him; and God moved them to depart from him.