“And there was a great battle in heaven, Michael and his angels fought with the dragon, and the dragon fought and his angels; and they prevailed not, neither was their place found any more in heaven. And the great dragon was cast out, that old serpent, who is called the devil and Satan, who seduceth the whole world; and he was cast unto the earth, and his angels were thrown down with him.”
~ Apocalpyse 12: 7-9
The ultimate conflict has been ongoing ever since the first battle was fought in Heaven. Actually this battle is one great continuous conflict between Good and Evil that has come down to us through the ages.