'Disguised' in the Bible

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.

Nevertheless Josiah would not turn his face from him, but disguised himself, that he might fight with him, and didn't listen to the words of Neco from the mouth of God, and came to fight in the valley of Megiddo.