Knežević was born on 30 November 1755 at Gračac, in a part of Habsburg Monarchy known as Croatian Military Frontier, as the youngest son of baron Martin Knežević, major general of the Habsburg army, and his wife Uršula Knežević née Vukasović. He had five brothers, who all were military officers, and two sisters. He started his career in 1772 as cadet in the Royal Hungarian Noble Body Guard at Viennese Court. In the Austro-Turkish War he recruited and led a freikorps to fight against the Ottoman Empire. Together with major Josip Filip Vukasović he distinguished himself in 1789 during the battle of Cetingrad. In the War of the First Coalition he was major and led a squadron of hussars in western Galicia. He attained the ranks of Oberstleutnant in 1796 and Oberst in 1797. In the latter year he became the commanding officer of the Archduke Joseph Palatine Cavalry Regiment Nr. 17. In 1798 the unit was redesignated Hussar Regiment Nr. 2 and stationed in Inner Austria. In the War of the Second Coalition Knežević led his hussar regiment at the Battle of Cassano on 26 April 1799. The regiment's eight squadrons were part of Johann von Zoph's 1st Division. Near Vaprio d'Adda, the Palatine Hussars launched three attacks and finally broke through Paul Grenier's division, inflicting 200 casualties and capturing 300 French soldiers outright. Together with other Austrian and Russian units, they rounded up 2,800 prisoners and collected as trophies 12 cannons, one howitzer, six ammunition wagons, and one standard. The regiment's losses were severe, 153 killed. For this exploit, Knežević received the Knight's Cross of the Military Order of Maria Theresa on 15 May 1799. On 28 April, his regiment was part of the force that trapped Jean-Mathieu-Philibert Serurier's division and compelled it to surrender. French losses in the clash were 252 killed with eight guns and 2,700 men captured.
Knežević led his hussars with distinction at the Battle of the Trebbia on 17 to 20 June 1799. In this action, his unit was part of Friedrich Heinrich von Gottesheim's Avantgarde of the Left Column. On 19 June, the hussars helped throw back François Watrin's French division. He was also at the Battle of Novi on 15 August. In that action, the Palatine Hussars fought in Pál Kray's corps. From 16 November to 3 December, he and his hussars participated in the siege of Cuneo under the command of Johann I Joseph, Prince of Liechtenstein. At the end, the 3,000-man garrison surrendered the fortress with 187 guns and 14,000 hundredweight of gunpowder. According to historian Digby Smith, Knežević was promoted to General-major on 29 October 1800. However, another source shows that he commanded a brigade with the rank of General-major in Konrad Valentin von Kaim's 4,939-man division at the Battle of Marengo on 14 June 1800. His command included three battalions of the Infantry RegimentGrand Duke of Tuscany Nr. 23, a total of 2.188 soldiers. During the late morning, Kaim's division repeatedly attacked the French line behind Fontanone Creek with little success. Later in the day, all three brigades of Kaim's division joined the pursuit under Anton von Zach and were involved in the rout of the main column at the end of the battle.
Napoleonic Wars
During the War of the Third Coalition, Knežević led an infantry brigade in Franz Xaver Saint-Julien's division. His brigade fought in actions at the Strub Pass on 2–3 November 1805 and at Scharnitz and Leutasch on 4 November. At Strub Pass, the Austrians defeated Bavarians under Bernhard Erasmus von Deroy and at Sharnitz repulsed French VI Corps troops. In both actions the Austrians lost few men while inflicting heavy losses. However, at Leutasch, the French wiped out 936 Austrians, enabling Marshal Michel Ney's troops to occupy Innsbruck. Knežević was named Chamberlain on 7 January 1808 and elevated in rank to Feldmarschall-Leutnant on 14 August 1808. He was appointed Proprietor of the Dragoon Regiment Nr. 3 on 14 April 1809 and would retain this dignity until his death. The former proprietor was Frederick I of Württemberg. He was named deputy commander of the Banal Military Border from February to November 1809. Knežević was given command of the 3rd Division in Ignaz Gyulai's IX Armeekorps at the outbreak of the War of the Fifth Coalition. His division consisted of Andreas Stoichevich's brigade of eight Grenz infantry battalions, two garrison battalions, and eight 3-pound cannons. However, the corps structure was immediately changed so that 10,000 troops under Johann Gabriel Chasteler de Courcelles could be sent to support the Tyrolean Rebellion. Meanwhile, Stoichevich was detached to fight against Auguste de Marmont in the Dalmatian Campaign. Knežević fought at the Battle of Graz on 24–26 June 1809. From October 1810 to April 1812 Knežević served as commander of the Varaždin generalate of the Military Frontier. He was elected the Vizekapitän of Dalmatia, Croatia and Slavonia in 1813. He led the Reservekorps of the Army of Italy in April and May 1815. When he retired on 22 September 1815 he was promoted to General der Kavallerie. He was named Privy Councillor in 1823.
Family
In 1793 Knežević married baroness Karoline Högger von Bernlach und Weisenburg. They had two sons, Aleksandar and Konstantin. Three older brothers also became Austrian generals. These were Juraj /Georg Anton/, Ivan /Johann Karl/ and Petar /Peter Vinzenz/. Knežević died in Sveta Jelena on 11 March 1832. Baron Minutillo succeeded him as proprietor of Dragoon Regiment Nr. 3.
