It is important to note Islam was used by God to block the spread of the papacy and to allow the Protestant Reformation to succeed. The pope's armies had to deal with Islam and thus Luther and the reformation were not the object of war.
The fifth and sixth trumpets are an accurate prophecy of the attack and then the fall of Constantinople, then the fall of the Ottoman Empire in 1840. The dates are accurate when using a day for a year principle.
In the year 1840 another remarkable fulfillment of prophecy excited widespread interest. Two years before, Josiah Litch, one of the leading ministers preaching the second advent, published an exposition of Revelation 9, predicting the fall of the Ottoman Empire. According to his calculations, this power was to be overthrown "in A.D. 1840, sometime in the month of August;" and only a few days previous to its accomplishment he wrote: "Allowing the first period, 150 years, to have been exactly fulfilled before Deacozes ascended the throne by permission of the Turks, and that the 391 years, fifteen days, commenced at the close of the first period, it will end on the 11th of August, 1840, when the Ottoman powerin Constantinople may be expected to be broken. And this, I believe, will be found to be the case."--Josiah Litch, in Signs of the Times, and Expositor of Prophecy, Aug. 1, 1840.
At the very time specified, Turkey, through her ambassadors, accepted the protection of the allied powers of Europe, and thus placed herself under the control of Christian nations. The event exactly fulfilled the prediction. GC 334,5.