The hope proved deceptive. On 19 August 1691, Fazıl Mustafa Pasha was struck in the forehead by a bullet at the Battle of Slankamen (northwest of Belgrade). The Ottomans suffered a devastating defeat at the hands of Ludwig Wilhelm von Baden, the commander-in-chief of the Imperial Army in Hungary, nicknamed "Türkenlouis" (Louis the Turk) for his victories. Called "the bloodiest battle of the century" by contemporaries, the defeat at Slankemen cost the lives of 20,000 men and the Ottoman's most capable military commander.