He lived in Teutschenthal near Halle (Saale), where he was captured as a deserter in 1811 and imprisoned at Kassel.
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Willisen was born in Staßfurt as the third son of the mayor of Staßfurt, Karl Wilhelm Hermann von Willisen (1751–1807) and his wife Friederike von Trotha (1768–1826).
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On 11 April he concluded the convention of Jarosławiec, by which the Polish forces under the command of Ludwik Mierosławski were acknowledged but reduced to a size of 3,000 located in different camps and a Polish administration was to be established.
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