We will never forget the September 11 Muslim suicide attacks organized by al-Qaeda upon the United States on September 11, 2001.
On that day 2,977 innocent people died because some devout Muslim believers decided that it was the right time to inaugurate a new offensive aiming to reinstate the caliphate (abolished by Atatürk in 1924 on March 3).
Many people believe that the date - 11 of September, chosen by the Muslim terrorists for the attacks, was not accidental at all and that it was in fact meant to be very symbolic as the Battle of Vienna took place on the 11 and 12 of September 1683.
The battle of Vienna was the turning point in the struggle against Muslim attempts to conquer Europe.
Since the Battle of Vienna the military might of the Ottoman empire fell into continuous decline and perhaps this is why the al-Qaeda leaders chose the anniversary of this event to show the world that the Muslim forces were back in business again.
Battle of Vienna 1683 - Kudos to Rogvist
Of course there cannot be any real comparison between the events as the Battle of Vienna was a defensive one and fought against a much stronger (at least in numbers) aggressor, whereas the 911 attacks were aimed at innocent, civilians (in both cases Muslims were the aggressors).
To us however, both events should symbolize an ongoing struggle against the same enemy - ISLAM , and they should be commemorated together.
Different place, different time, the same enemy.