The Auspicious Incident (or Event) (Turkish: (in Istanbul) Vaka-i Hayriye "Fortunate Event"; (in Balkans) Vaka-i Serriyye, "Unfortunate Incident") was the forced disbandment of the centuries-old Janissary corps by Sultan Mahmud II on 15 June 1826. Most of the 135,000 Janissaries revolted against Mahmud II, and after the rebellion was suppressed, its leaders killed, and many members exiled or imprisoned, the Janissary corps was disbanded and replaced with a more modern military force.