It was a detachment from the 6th combined infantry regiment, consisting (p. 525) of 1 officer, 5 NCOs, 1 drummer and 35 men.

https://books.google.de/books?id=ZULdY5_eNpIC&pg=PA524

Ciesielsky rejoined his regiment on 6 March 1813 in Kallies (today Kalisz Pomorski).

https://books.google.de/books?id=ZULdY5_eNpIC&pg=PA545 (bottom left)

I do not know what their task was.