John Gill Commentary 2 Kings 3:21

"Now when all the Moabites heard that the kings were come up to fight against them, they gathered themselves together, all that were able to put on armor, and upward, and stood on the border." — 2 Kings 3:21 (ASV)

And when all the Moabites heard that the kings were come up to
fight against them
The kings of Israel, Judah, and Edom:

they gathered all that were able to put on armour, and upward ;
that were of an age capable of that, and all who were more grown; or "girt on a girdle" ^F12 , a military one, with which the sword was girt, who were at age to wear and knew how to wield a sword: and stood in the border; of their land, between Edom and them, to defend themselves and their country against these invaders.

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FOOTNOTES:

• F12: (hrgx rgx) "eingente cingulo", Montanus.