The king of Israel suggested to Jehoshaphat, "I'll go into battle in disguise, but you keep your royal uniform on." So the king of Israel disguised himself and they both went into the battle.

Therefore He brought up against them the king of the Chaldeans who slew their young men with the sword in the house of their sanctuary, and had no compassion on young man or virgin, old man or infirm; He gave them all into his hand.