In Rev 9:16, the Bible tells us that the 4 angels at the Euphrates will be loosed. As a result, a 200 million (200,000,000) person army proceeds to kill the 1/3 part of humankind. This is a main feature of the 6th seal of Revelation. The Book of Revelation is highly symbolic. Therefore, it is important to analyze the symbolic meaning of this 200 million army poised at the Euphrates River. Please consider viewing the You Tube video at the link below. Or, please consider viewing the Revelation 8-10 study notes on this subject on this website.