The Siege of Gyula was a prolonged Ottoman siege of the Hungarian fortress of Gyula in 1566, part of Suleiman I's last campaign. The fortress was an important Habsburg defensive stronghold in eastern Hungary and represented a key point in the frontier system between Habsburg and Ottoman territories. Gyula was situated within the Ottoman network of fortresses at Temesvár, Szeged and Szolnok, and controlled access to the Körös valley route, making it the campaign's second major target after Szigetvár. The siege lasted 63 days, making it the longest siege in 16th-century Hungary.
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