Thanks Charles for this, it answers all my questions at once.
By the way I am used to decypher German transcription of Russian names in loss reports, but
Kolobowka = Kolotowskij was rather hard to find.
Except that... a search on maplandia finds nothing for Kolotowskij. Ljudinowo is the German form of Lyudinovo, Kaluga region, and there is a place called Kolotovka just to the SE of it:
http://www.maplandia.com/russia/kalu...yon/kolotovka/
Starting from that, I found that this place is called apparenly both Kolotovka or Kolotovskiy, as seen below by the two links pointing to the same point on the map:
http://fr.getamap.net/cartes/russia/.../_kolotovskiy/
http://fr.getamap.net/cartes/russia/...st/_kolotovka/
Kolotovka seems to me more used on the Web.
Thanks again