Revelation 9:13-16

13Then the sixth angel sounded [his trumpet], and I heard a solitary voice from the four horns of the golden altar which stands before God,

14saying to the sixth angel who had the trumpet, “Release the four angels who are bound at the great river Euphrates.”

15So the four angels, who had been prepared for the [appointed] hour and day and month and year, were released to kill a third of mankind.

16The number of the troops of cavalry was twice ten thousand times ten thousand (two hundred million); I heard the number of them.