What does Isaias Chapter 21 say, and which statements belong to its speaker?

Isaias 21 begins with the desert-of-the-sea burden and whirlwinds from a terrible land. The edition identifies Babylon and explains its desolation, and identifies Elam with Persia. A grievous vision of unfaithfulness and spoiling accompanies summons to Elam and Mede to besiege, with mourning ended. The speaker suffers labourlike anguish, falls at hearing, is troubled at seeing, and says beloved Babylon has become a wonder. The admitted words are not replaced with a formerly desired night turning fearful.

Preparing the table and watching those eating and drinking lead to a summons to princes to take up shields. A watchman is set to report what he sees: a chariot with two horsemen and riders on ass and camel. The edition identifies the two riders as Persian and Median kings. A lion's cry describes day-and-night standing watch; the edition interprets this as Isaias crying over approaching ruin. The rider announces Babylon fallen and its graven gods broken. What the speaker heard from the Lord is declared to his threshing and floor's children. Banquet luxury, careless motives and greased shields are not supplied.

Duma's call from Seir twice asks about night. The edition identifies Duma as Edom; the answer retains morning, night, seeking and returning. Arabia's burden concerns sleeping in the forest on Dedanim's paths. Southern inhabitants are asked to bring water and bread to people fleeing swords, bent bow and grievous battle. Within a hireling year Cedar's glory is taken away and its strong archers diminished; the edition identifies Cedar as Arabia. The year's decree is not assigned to Edom.