They do claim that the WTS was expecting massive upheaval and catastrophe in 1914.
*** The Watchtower 1971 8/1 p. 468 ***
5 From Bible chronology, Jehovah’s witnesses as far back as 1877 pointed to the year 1914 as one of great significance. The Watchtower as of March 1880 said: “‘The Times of the Gentiles’ extend to 1914, and the heavenly kingdom [of God] will not have full sway till then.” While they were not yet clear on just what the details would be, in the nearly four decades preceding 1914 they sounded the warning that the future for this present system would not be one of peace, security and prosperity for mankind, but that in 1914 the world would come to the greatest time of trouble ever. In 1897 the book The Battle of Armageddon, (at first entitled “The Day of Vengeance”) published by Jehovah’s witnesses, said that this trouble would be “more general and widespread, and more destructive, as the machinery of modern warfare signally suggests. Instead of being confined to one nation or province, its sweep will be over the whole world, especially the civilized world, Christendom.”
6 The momentous year of 1914 came, and with it World War I, the most widespread upheaval in history up to that time. It brought unprecedented slaughter, famine, pestilence and overthrow of governments. The world did not expect such horrible events as took place. But Jehovah’s witnesses did expect such things, and others acknowledged that they did.
What Russell actually had to say was significantly different:
How refreshing the prospect brought to view at the close of these seven times! Neither Israel nor the world of mankind represented by that people will longer be trodden down, oppressed and misruled by beastly Gentile powers. The Kingdom of God and his Christ will then be established in the earth, and Israel and all the world will be blessed under his rightful and righteous authority. […]
But at the end of the Gentile Times the sure signs of spring will not be lacking, and rich will be the summer fruitage and glorious the autumnal harvest to be reaped and enjoyed in the eternal ages of glory to follow. […]
True, it is expecting great things to claim, as we do, that within the coming twenty-six years all present governments will be overthrown and dissolved; but we are living in a special and peculiar time, the "Day of Jehovah," in which matters culminate quickly; and it is written, "A short work will the Lord make upon the earth." (See Vol. I, chap. xv.)
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 near the end of A.D. 1914.
[1912 edition reads: “will be accomplished near the end of A.D. 1915.”] (The Time is at Hand (1889):p. 98f)