The writtings of jesus indicated the end would come during their generation. He died about 33 less then 40 years later Jerusalem was destroyed in 70 and just a couple three years later the last of the rebels were pushed up Mt meggedo ( Armageddo) . There they all died. Maybe the writtings of Revelations were in part to prepare the Jewish rebels out side of Jerusalem for their attack's, persecution and salvation as martyrs?
This was all written after the fact and makes for a great saga.