In Revelation chapters 8, 9, and Re 11, we read of seven angels who blew seven trumpets, heralding plagues of great intensity on portions of mankind. These represent proclamations of Jehovah’s judgments that have been publicized by Jehovah’s people throughout the time of the end starting notably with the Cedar Point convention of 1922.​—See Revelation—​Its Grand Climax At Hand!, chapters 21 to 23 and chapter 26.

Why, then, does the Revelation Climax book say that these four trumpets only started to be blown at the Cedar Point convention in 1922? Because it was then that the call went forth to “advertise, advertise, advertise the King and the Kingdom,” giving great impetus to the preaching activity. The November 1, 1922, issue of The Watch Tower, says: “The friends . . . took it as the keynote of the convention that the real privilege and duty of the consecrated now on earth is to advertise the presence of the Lord, the great King of kings, and that his kingdom is here, and that this is the most important thing for them to do.”

It should also be noted that while all four of these judgment messages have been publicized by Jehovah’s Witnesses since 1922, each in turn received a powerful impetus from the adoption of four resolutions at conventions held between 1922 and 1925. Tens of millions of copies of these resolutions were subsequently distributed in printed form, effectively exposing Christendom’s spiritually dead state.​—See the Revelation Climax book, page 133, paragraph 15.

At the Cedar Point convention in 1922, all three “woes” became evident to the world at large. The preaching campaign then initiated made it clear that “the locusts” were out of “the abyss” and the charge by the “cavalry” was under way. And the stirring call to advertise the King and the Kingdom was in full harmony with the seventh trumpet blast. The March 1, 1925, issue of The Watch Tower explained that events in 1914, 1919, and 1922 were foretold in Revelation chapter 12. This was a deeper understanding of the birth of the Kingdom, and it was faithfully publicized by Jehovah’s Witnesses. In addition, the announcing of this plaguing information received a major impetus from the adoption and subsequent distribution of powerful resolutions during conventions held from 1926 to 1928.​—See Revelation—​Its Grand Climax At Hand!, pages 147, 149, 172.