One of the known battles taking place in Vienna, Austria was known as the Battle of Vienna on the 11th and 12th of September, 1683 when the imperial city was besieged by the Ottoman Empire for two months. The battle was fought by the HRE (Holy Roman Empire) of known German Nations and league with the Polish-Lithuanian Commonwealth's Holy League and the battle was against the invaders of the Sunni Muslim Ottomans and chiefdom of the empire. It took place at Kahlenberg Mountain located near or somewhat next to Vienna where the battle marked the first time Poland and the HRE cooperated militarily against the Turkish peoples. It was known to be a turning point in history when the Ottomans ceased to be a menace to the Christian world (Europe) and in the ensuing war which ended in 1698 is when the Turks lost almost all of Hungary to the Holy Roman Emperor Leopold I.
The battle ended with the HRE and the Polish-Lithuanian Commonwealth winning and it represented only by the forces of the Crown of the Kingdom of Poland because the march of the Lithuanian army was delayed and they reached Vienna when the city was already relieved of it's siege. The Viennese garrison also was led by Ernst Rüdiger Graf von Starhemberg who was an Austrian subject of Leopold I. There was an overall command which held by senior leader who was king of Poland, John III Sobieski in which he led the Polish forces.
The military forces of the Ottoman Empire who opposed the HRE were commanded by the Grand Vizier Merzifonlu Kara Mustafa Pasha and an Ottoman army of approximately 90,000-300,000 men began their siege during the course of July 14, 1683. Turkish forces also consisted of 60 ortas of Janissaries which were 12,000 men in paper-strength which there was an army of observation roughly being 70,000 men who watched. The battle took place on September 11, when the army of about 46,000 men arrived.
Historians also seem the battle was marked the turning-point in the Ottoman Habsburg Wars which there was a 300-year struggle between the Holy Roman and Ottoman empires. During sixteen years which followed the battle, the Austrian Habsburgs recovered and dominated all of Southern Hungary over to Transylvania and it cleared out a large portion of Turkish forces. This was when the battle was also noted for including largely known cavalry charges during history.