John Gill Commentary 2 Kings 8:21

"Then Joram passed over to Zair, and all his chariots with him: and he rose up by night, and smote the Edomites that compassed him about, and the captains of the chariots; and the people fled to their tents." — 2 Kings 8:21 (ASV)

So Joram went over to Zair
A city in Edom, the same with the Zaara of Ptolemy ^F9; some take it to be the same with Seir, the mountain or country of that name:

and all the chariots with him;
all the chariots of war he had:

and he rose by night, and smote the Edomites which compassed him about;
who came out of their cities in great numbers, and surrounded him, he having entered into their country in an hostile way, to subdue them:

and the captains of the chariots;
which belonged to the Edomites; those he smote, (2 Chronicles 21:9)

and the people fled into their tents;
the army being routed.

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FOOTNOTES:

• F9: Geograph. l. 5. c. 17.