Revelation 9:18

18 A third of mankind was killed by the three plagues of fire, smoke and sulfur that came out of their mouths.

Read Revelation 9:18 Using Other Translations

By these three was the third part of men killed, by the fire, and by the smoke, and by the brimstone, which issued out of their mouths.
By these three plagues a third of mankind was killed, by the fire and smoke and sulfur coming out of their mouths.
One-third of all the people on earth were killed by these three plagues—by the fire and smoke and burning sulfur that came from the mouths of the horses.

What does Revelation 9:18 mean?

John Gill's Exposition of the Bible
Revelation 9:18

And by these three was the third part of men killed
The Alexandrian copy, and some others, the Complutensian edition, the Vulgate Latin, Syriac, and Ethiopic versions, read, "by these three plagues": as the western Roman empire is in the preceding chapter frequently expressed by the third part of several things, see ( Revelation 8:7-12 ) ; so here the eastern Roman empire by the third part of men; vast numbers of the inhabitants of which were destroyed by the Turks, through the use of guns, out of which issued fire, smoke, and brimstone; and Constantinople, the metropolis of it, was taken in this way, as before observed, with the taking of which the empire ceased.

By the fire, and by the smoke, and by the brimstone, which issued
out of their mouths;
that is, by the firing of guns.

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