During the French invasion, the Battle of Lübeck, he was mortally wounded by a bullet in the hallway of his home.
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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.