Chapter 4: The Great and Enduring Heresy of Mohammed
The last effort they [Islam] made to destroy Christendom was contemporary with the end of the reign of Charles II in England and of his brother James and of the usurper William III. It failed during the last years of the seventeeth century, only just over two hundred years ago. Vienna, as we saw, was almost taken and saved by the Christian army under the command of the King of Poland on a date that ought to be among the most famous in history-- September 11, 1683.
The Great Heresies by Hilaire Belloc (Sheed and ward, 1938), pg. 70-71.