The date of the close of that 'battle' is definitely marked in Scripture as October, 1914. It is already in progress, its beginning dating from October, 1874. Zion's Watch Tower, 15 January 1892, page 1355
We see no reason for changing the figures--nor could we change them if we would. They are, we believe, God's dates, not ours. But bear in mind that the end of 1914 is not the date for the beginning, but for the end of the time of trouble.
Zion's Watch Tower, 15 July 1894, page 1677
There are more quotations out there, as to what they were saying prior to 1914.
Paul