I will punish the king of Babylon, and that nation (Isaiah 21)

Isaiah chapter 21 is a medium-sized chapter that has few notes. The one note that it has other than "Boring" is a note that it's absurd that Isaiah is in pain; I'm not sure why this should be absurd whether it's actual physical pain or some metaphor of emotional anguish, either way, it happens. Anyway, the first part of the chapter is a prophecy about Babylon, and the second part is about Edom and Arabia. In both cases, the prophecy seems to be about coming military conquest, with no time frame for the former but a year for the latter.