Simply put, the 1529 Siege of Vienna did not go the way the Ottoman Empire hoped it would. Sultan Suleiman I, the Magnificent, was coming off a fresh string of victories in Europe and elsewhere when he decided that the road to an Ottoman Europe had to be paved through the legendary city of Vienna. He boasted that he would be having breakfast in Vienna's cathedral within two weeks of the start of his siege.
When the day came and went, the Austrians sent the Sultan a letter, telling him his breakfast was getting cold.
When you drop sick taunts, you must then drop sick beats.
The Sultan had a reason to be cocky going into the Siege of Vienna. He had just brought down the Hungarians, the longtime first line of defense for European Christendom. Hungary lost its king and fell into a disastrous civil war which the Ottomans intervened in. The Habsburgs, who controlled half of Hungary and all of Austria at this time, weren't having any of it and Hungary was split for a century after. For the time being, however, the Ottomans and their Hungarian allies were going head-to-head with Austrian Archduke Ferdinand I, pushing the Austrians all the way back to Vienna in less than a year.
But Europe's Christian powers were not going to let Austria fall without a fight and so sent help to the besieged city. That help came in the form of German Landsknechts, Spanish Musketeers, and Italian Mercenaries. It was the furthest the Islamic armies had ever penetrated Europe's heartland. But Suleiman would fail to take the city.
Look, if you want to have breakfast in church, most Christians will happily oblige you.
The torrential rains started almost immediately, meaning the Turkish armies had to abandon its powerful cannons, along with horses and camels who were unaccustomed to the amount of mud they had to trudge through. Even so, they still came with 300 cannons and outnumbered the defenders five-to-one. The allied troops inside the city held their own against the Turkish onslaught as the rain continued.
Sickness, rain, and wounds hounded the Ottoman armies until snowfall took the place of the rain. The Ottomans were forced to retreat, leaving 15,000 men killed in action behind.
The Sultan would never get his breakfast in the cathedral. No sultan would ever get breakfast in an Ottoman Vienna.