This is an apolitical forum for discussions on the Axis nations and related topics hosted by the Axis History Factbook in cooperation with Christian Ankerstjerne’s Panzerworld and Christoph Awender's WW2 day by day.
Founded in 1999.
Based on the design of the battery and the type of weapon I would guess that the most likely location fort de l'île Pelée at Cherbourg. I emphasize that this is a guess with about a 20 % chance of being correct.
Thanks for the confirmation. I was also relatively certain but lack the doctrinal material to declare it 100%. Old habits from military intelligence processing.
That gun appears to be on a test range not in a coast defense set up. Note two other bases visible in the picture and the overhead crane on the left. While I can't id the gun, it's clearly being test fired or proofed on a range.