 Al-Hassan interprets Ibn Khaldun as reporting the use of cannon as siege machines by the Marinid sultan Abu Yaqub Yusuf at the siege of Sijilmasa in 1274. Super-sized bombards were used by the troops of Mehmed II to capture Constantinople, in 1453. Urban, a Hungarian cannon engineer, is credited with the introduction of this cannon from Central Europe to the Ottoman realm. It could fire heavy stone balls a mile, and the sound of their blast could reportedly be heard from a distance of 10 miles (16 km).
