The Auspicious Incident was the disbandment of the centuries old Janissary corps by Ottoman sultan Mahmud II.
By the early 17th century, the Janissary corps had ceased to function as an elite military unit. Many Janissaries were not soldiers and simply extorted money off the Turkish state and dictated it's government, leading to the slow decline of the Ottoman Empire. Any sultan who attempted to modernize the Ottoman military structure and replace the Janissaries was either immediatly killed or deposed.
By 1826, the Janissaries were almost univerisally hated throughout Turkey. When they noticed that the sultan Mahmud II was forming a new army they mutinied, but the Spahis forced them to retreat to their barracks. In the ensuing fight the Janissary barracks were set in flames by artillery fire resulting in a massive amount of casualties. Survivors were eitheir exiled or executed and their possesions confiscated by the sultan.
