Moab is spoiled, and gone up out of her cities, and his chosen young men are gone down to the slaughter, saith the King, whose name is the LORD of hosts. Moab is ... gone up ... his chosen young men are gone down to the slaughter - in antithesis.
Out of her cities - rather, 'Moab ... and her cities are gone up'-namely, pass away in the ascending smoke of their conflagration (Joshua 8:20-21; Judges 20:40). When this took place, the young warriors would go down from the burning citadels only to meet their own slaughter (Grotius). The English version is somewhat favoured by the fact that "gone out" is singular, and cities plural, which seems to imply that "Moab" alone is nominative to it, and not also "her cities." Maurer thinks the singular is used in reference to the thing signified-namely, not that her cities are gone up, but the smoke of them is gone up. The antithesis favours Grotius.