Thank you for your answer. That helped me.
I don`t have pictures of the bunkers and canons.
There are a lot of pictures where they are eating in the Kasino. Seemed to be more important than doing military stuff

some pictures in the attachments....
First and last one the grandfather of my girlfriend with his crew and the other one the grandfather at the beach.
His name is Oberleutnant Stahl. So the battery is named after him.