Read 2 Chronicles 21:9 Using Other Translations
Then Jehoram went forth with his princes, and all his chariots with him: and he rose up by night, and smote the Edomites which compassed him in, and the captains of the chariots.
Then Jehoram passed over with his commanders and all his chariots, and he rose by night and struck the Edomites who had surrounded him and his chariot commanders.
So Jehoram went out with his full army and all his chariots. The Edomites surrounded him and his chariot commanders, but he went out at night and attacked them under cover of darkness.