\v 13 Then the sixth angel blew his trumpet, and I heard a voice from the four corners of the golden altar that is in God's presence.
\v 14 That voice was saying to the sixth angel, the one who had the trumpet, "Release the four angels who are tied up at the great river Euphrates."
\v 15 Then those four angels went free. They were the angels who were waiting for that exact hour of that day, month, and year. They went free in order that they might help their soldiers kill one-third of the people.
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John Hutchins
TomWarren
Jesse Griffin