His Prussian service record:

23 April 1801: Kornett in the Regiment Gensd'armes [K 10]
8 February 1803: Sekonde-Lieutenant
14 October 1807: honorably dismissed

He liked to perform as a dancer:

https://books.google.de/books?id=bqNU9EVdNiAC&pg=PA315&lpg=PA315&dq=pourtales