In the time of Jehoram, Edom rebelled against Judah and set up its own king.
So Jehoram went to Zair with all his chariots. The Edomites surrounded him and his chariot commanders, but he rose up and broke through by night; his army, however, fled back home.
To this day Edom has been in rebellion against Judah. Libnah revolted at the same time.