18 By these three plagues were the third part of men killed, by the fire and the smoke and the brimstone which goes out of their mouths.
And the four angels were loosed, who are prepared for the hour and day and month and year, that they might slay the third part of men;
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Commentary on Revelation 9 Matthew Henry Commentary
Chapter 9
In this chapter we have an account of the sounding of the fifth and sixth trumpets, the appearances that attended them, and the events that were to follow; the fifth trumpet (v. 1-12), the sixth (v. 13-21).
Rev 9:1-12
Upon the sounding of this trumpet, the things to be observed are,
Rev 9:13-21
Here let us consider the preface to this vision, and then the vision itself.