sentences:  The last remaining mercenaries were integrated into local garrisons, such as the one in Nándorfehérvár (Belgrade) under the leadership of Balthasar Tettauer, brother of Wilhelm Tettauer.They were so frustrated about their financial status that they allied with Ottoman Mihaloğlu Ali Bey to secretly hand over the fort to his sultan, Bayezid II.When their plan surfaced, Paul Kinizsi intervened in May 1494 before their act could take place.