Yep the the JWs back then we're preparing for Armageddon, it was supposed to take place in October 1914 and when it didn't happen Russell wasn't all happy that the gentile times had ended no he was disappointed it didn't happen the way he had said. So he quickly rewrote one of his study in the scriptures books and in the new version he said he screwed up in his calculations and forgot to deal with the year zero between AD and BCE so he changed his understanding. In the new updated version of his book Armageddon was now to take place in October 1915.
One other note he was such an honest guy that when he wrote this new updated book some how the measurements of the interior of the great pyramid changed to coincide with his new prediction year of 1915.