In Luftwaffe Colours Schlachtflieger - Luftwaffe Ground-attack Units 1937-1945 (Ian Allan 2007)
https://www.amazon.de/Schlachtfliege.../dp/1857802748 there´s a whole chapter about this unit as far as I remember.
The Bü 181 is on the frontpage; they flew ground support sorties with underslung
Panzerfaust armour-piercing weapons.
Regards
RolandF