In the book ‘REVELATION ITS GRAND CLIMAX AT HAND’ in Chapter 18 (Earthquakes in the Lord’s Day ) on page 112, the writers mention that the sixth seal is going to be opened some time in the future and yet they go on to mention in Chapter 21 ( Jehovah’s Plagues on Christendom ) that the seven trumpets have already been blown and they give explanations of the fulfillment of these trumpet blasts in mankind’s’ history. However, I believe it is impossible for the seven trumpets to have been sounded before the opening of the sixth seal because firstly, as they pointed out in the book, the sounding of the seven trumpets is ushered in by the opening of the seventh seal, which seal is only opened after the sixth seal has been opened as happened with the other seals. The seals were opened or are opened in order form the first to the seventh, which is the last, without skipping one and going to the next.
Secondly, the events that occur after the opening of the sixth seal are proof that it has not been opened because as is said in Revelation 6:12-17 and I quote, ‘I saw when he opened the sixth seal, and there was a great earthquake. The sun became black as sackcloth made of hair, and the whole moon became as blood. The stars of the sky fell to the earth, like a fig tree dropping its unripe figs when it is shaken by a great wind. The sky was removed like a scroll when it is rolled up. Every mountain and island were moved out of their places. The kings of the earth, the princes, the commanding officers, the rich, the strong, and every slave and free person, hid themselves in the caves and in the rocks of the mountains. They told the mountains and the rocks, “Fall on us, and hide us from the face of him who sits on the throne, and from the wrath of the Lamb, for the great day of his wrath has come; and who is able to stand?” Whatever it is that is going to happen after the opening of the sixth seal will be evidence to every person on earth that the great day of the wrath of the Lamb and of the Lord God Almighty has come. It is not going to leave anybody in any doubt whatsoever of the meaning of the events as shown by that verse that ‘The kings of the earth, the princes, the commanding officers, the rich, the strong, and every slave and free person…’Every person on earth is going to recognize those events as signifying the arrival of the day of the wrath of the Lord Jesus and Almighty God. As far as I’m concerned, there is no point in our history were that has occurred. So to say that the seven trumpets have been sounded when the sixth seal has not yet been opened is not consistent with the Bible. I believe the events in Revelation are presented chronologically, first the seven seals then the seven trumpets then the seven bowls during which the war occurs then the thousand years then the judgment of the dead and the making of everything new.