バイエルン継承戦争
Yorck entered the Prussian Army in 1772 and achieved the rank of lieutenant in 1777. After seven years' service, however, he was cashiered for insubordination, having reproached his superior with plundering methods during the War of the Bavarian Succession. He spent one year in the confinement of Fort Friedrichsburg in Königsberg, whereafter King Frederick the Great denied him his re-employment.