Looking at Barbara's recent post about Rutherford and this one.
WT 7/15/1951
Furthermore, in 1925, for the first time, it was seen and understood that the Kingdom was actually born in 1914, that it was a fact. No longer was it a matter of proclaiming the time had come for the Kingdom, that the day was here for Satan’s world to end, but the Kingdom had come and was ruling from heaven, and already a war in heaven had been fought. The Watchtower for March 1, 1925, published this information.
What was taught about the war in heaven in the 1800's?