Take your pick!!
kj chap. 15 p. 286 par. 23 - "What a thrilling moment it will be when, during the coming “great tribulation” on this present system of things, the authentic news comes from all around the earth that the antitypical Jerusalem, Christendom, has fallen [allegedly the first part of Babylon the Great to go!] at the hands of Jehovah’s executional forces!"
re chap. 36 p. 260 par. 6 The Great City Devastated - "So by 1919 Babylon the Great had fallen, opening the way for God’s people to be released and restored, in one day as it were, to their land of spiritual prosperity."
w89 5/1 p. 5 Babylon the Great—Fallen and Judged - "Babylon the Great had fallen in 1919."
(sorry for typo in title! - don't know how to change it!)