Revelation 9:13-16

13Then the sixth angel blew his trumpet, and I heard a voice speaking from the four horns of the gold altar that stands in the presence of God.

14And the voice said to the sixth angel who held the trumpet, “Release the four angels who are bound at the great Euphrates River.”

15Then the four angels who had been prepared for this hour and day and month and year were turned loose to kill one-third of all the people on earth.

16I heard the size of their army, which was 200 million mounted troops.