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Because of his anti-Nazi attitude, Karl August was imprisoned in a Gestapo prison in Landshut from 1944 to 1945.
In 1813, however, he joined the Grand Alliance, and at the beginning of 1814 took command of a corps of 30,000 men operating in the Netherlands.
In 1806 Muffling served under Hohenlohe, Karl August, Grand Duke of Saxe-Weimar-Eisenach, and Blücher, and was included in the capitulation of the latter's corps at Ratekau on 7 November 1806, the day after the Battle of Lübeck.
In 1809 her lover, Grand Duke Karl August, made her "Freifrau (Baroness) von Heygendorff" and left her Heygendorf manor.