Suleiman's response came in 1532 when he led a massive army of over 120,000 troops to besiege Vienna again. Ferdinand withdrew his army, leaving only 700 men with no cannons and a few guns to defend Güns (Kőszeg). In the siege of Güns, the Grand Vizier of the Ottomans, Ibrahim Pasha, did not realize how poorly defended Koszeg was; in fact Constantinople in 1453 stood a better chance. Nonetheless, under the leadership of Croatian Captain Nikola Jurišić, the city fought off every assault. The exact outcome of the battle is unknown, since it has two versions which differ depending on the source. In the first version Nikola Jurišić rejected the offer to surrender on favourable terms, and in the second version, the city was offered terms for a nominal surrender. In any case, the Ottomans withdrew at the arrival of the August rains. During their retreat, they suffered a defeat at the Battle of Leobersdorf against an imperial army led by Frederick II, Elector Palatine.