Does anyone have any information on the location of German Gun Batterys in the Calais area in 1944.

I did have another post regarding the 17cm Kanone 18 shell i aquired with a mounted plaque on it, but i really would like to get to the bottom of where it could have come from, its not the sort of size you could have just popped in a bag and knowbody notice.

I did have some very useful help on my previous thread regarding the piece it was fired from, but i also found out there were a handful or railway mounted guns in this size.

i will post the pics again but any help would be great.

Click to enlarge the picture