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Johann von Klenau (13 April 1758 – 6 October 1819) was a field marshal in the Habsburg army. Klenau joined the Habsburg military as a teenager. In the early years of the French Revolutionary Wars, Klenau distinguished himself at the Wissembourg lines, and led a battle-winning charge at Handschuhsheim in 1795. As commander of the Coalition's left flank in the Adige campaign in 1799, he was instrumental in isolating the French-held fortresses on the Po River by organizing and supporting a peasant uprising in the countryside. Afterward, Klenau became the youngest lieutenant field marshal not of the House of Habsburg in the history of the Habsburg military. As a corps commander, Klenau led key elements of the Austrian army the battles of Aspern-Esslingen, Wagram, Dresden and at the Battle of Nations at Leipzig. In the 1814–15 campaign, he commanded the Corps Klenau of the Austrian Army of Italy. After the war in 1815, Klenau was appointed commanding general in Moravia and Silesia, a position he held until his death in 1819.