The Watchtower Society prophesied that Armageddon would come at 6 separate and distinct time periods and they were wrong.
1914 - "In view of this strong Bible evidence concerning the Times of the Gentiles, we consider it an established truth that the final end of the kingdoms of this world, and the full establishment of the Kingdom of God, will be accomplished by the end of 1914." (The Time is at Hand, 1902 edition, p. 99) Note: this same statement was contained in the 1908 edition of the same book.
End of WW1: “The present great war in Europe is the beginning of the Armageddon of the Scriptures (Revelation 19:16-20). It will eventuate in the complete overthrow of all the systems of error which have so long oppressed the people of God and deluded the world”. (Pastor Russell's Sermons, 1915, p. 676) In the same year (1915),
1925 - “The period must end in 1925 . . . [This date] is definitely fixed in the Scriptures. Every thinking person can see that a great climax is at hand. The scriptures clearly indicate that the climax is the fall of Satan's empire and the full establishment of the Messianic kingdom . . . Therefore, it can be confidently said at this time that millions now living will never die”. (Golden Age, January 4, 1922, p. 217)
1975 - Watchtower, October 15, 1969 pages 622 and 623:
"More recently earnest researchers of the Holy Bible have made a recheck of its chronology. According to their calculations the six millenniums of mankind's life on earth would end in the mid-seventies…. Would not, then, the end of six millenniums of mankind's laborious enslavement under Satan the Devil be the fitting time for Jehovah God to usher in a Sabbath millennium for all his human creatures? Yes, indeed! And his King Jesus Christ will be Lord of that Sabbath."
Notice the use of the definite article “the”. It would be “the fitting time”, not “a fitting time” not “an appropriate time” but “THE FITTING TIME”, to the exclusion of all other times. “Yes, Indeed! And his King Jesus Christ will be Lord of that Sabbath”. Not “might be”, not “could be”, but “WILL BE”.
• End of the 20th Century - Again in 1971, they said it would come in the 20th century: ”Shortly, within our twentieth century, the “battle in the day of Jehovah” will begin”. From: The Nations Shall Know That I Am Jehovah - How? 1971 p. 216”
Within the life span of the 1914 generation: Watchtower, 7/1/69 pg395:
“People who were only just old enough to understand what was happening to the world in 1914 are now approaching seventy years of age. Yes, the numbers of that generation are dwindling fast, but before they all pass away this system must meet its end in the war of Armageddon.”
None of the above happened and as of 1995, the above 1914 thing is wrong.
I vaguely remember something about the preaching work stopping before Armageddon, but in my later as a Jo Ho, I don't remember them saying that.