9. chariot of men--chariots with men in them; or rather, the same body of riders, horsemen two abreast, as in Isa 21:7 [MAURER]. But HORSLEY, "The man drawn in a car with a pair of riders." The first half of this verse describes what the watchman sees; the second half, what the watchman says, in consequence of what he sees. In the interval between Isa 21:7 and Isa 21:9, the overthrow of Babylon by the horsemen, or man in the car, is accomplished. The overthrow needed to be announced to the prophet by the watchman, owing to the great extent of the city. HERODOTUS (1.131) says that one part of the city was captured some time before the other received the tidings of it.
      answered--not to something said previously, but in reference to the subject in the mind of the writer, to be collected from the preceding discourse: proclaimeth (Job 3:2, Margin; Da 2:26; Ac 5:8).
      fallen . . . fallen--The repetition expresses emphasis and certainty (Ps 92:9; 93:3; compare Jer 51:8; Re 18:2).
      images--Bel, Merodach, &c. (Jer 50:2; 51:44, 52). The Persians had no images, temples, or altars, and charged the makers of such with madness [HERODOTUS 1.131]; therefore they dashed the Babylonian "images broken unto the ground."

JFB.