There is another book out dealing with a Hessian officer captured in Russia:
The Ordeal of Captain Roeder: from the Diary of an Officer in the First Battalion of Hessian Lifeguards during the Moscow Campaign of 1812-1815 Translated and Edited by Helen Roeder; London: Methuen, 1960. 248 pages.
The majority of the book covers the events prior to his capture. It is remarkable that there are two "diaries" written by Hessian officers captured by the Russians.