Ottomans conquer Serbia
Smederevo, SerbiaThe Ottomans had occupied the larger part of Serbia by the end of 1438. In the same year, Ottoman troops—supported by Vlad II Dracul, Prince of Wallachia—made an incursion into Transylvania, plundering Hermannstadt/Nagyszeben, Gyulafehérvár (present-day Alba Iulia, Romania) and other towns. After the Ottomans laid siege to Smederevo, the last important Serbian stronghold in June 1439, Đurađ Branković, Despot of Serbia fled to Hungary to seek military assistance.