2 Kings 8:20-22

In his days Edom revolted from the rule of Judah, and set up a king over themselves. So Jehoram [king of Judah] went over to Zair [in Edom] with all his chariots. He set out by night and struck down the Edomites who had surrounded him and the captains of his chariots; but the people [of his army] fled to their tents. So Edom revolted against Judah to this day. Then Libnah revolted at the same time.