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.