In early June 1592 Hasan Pasha led his troops towards Bihać, which was defended by around 500 soldiers and commanded by Captain Joseph von Lamberg. The siege lasted from 10 June to 19 June, when Lamberg surrendered the city due to a lack of reinforcements and an insufficient number of defending troops. Lamberg was for this act later tried for treason. Although under the terms of the surrender its citizens were to be allowed to leave or remain in the city without harm, more than 2,000 civilians were killed and 800 were taken captive after Hasan Pasha's troops entered Bihać. The offensive lasted until June 1593 when Hasan Pasha was killed in the Battle of Sisak, which was the cause for the Long Turkish War (1593-1606).