At Longues-sur-Mer we visited a German artillery unit with guns and an observation post. This is the only artillery unit with the guns still there. The range of this artillery unit was 20 kilometers. The walls and the ceiling are 2 meters of concrete. 300 meters in front of the artillery is the post where the distance to a target at sea was appointed by a range finder. From here the coordinates were given to the artillery unit.
Before D-day this artillery was bombarded, but not seriously damaged. Its range was Gold and Omaha beach and thus it had to be destroyed. Just before June 6th, four warships took turns shooting at the artillery battery and destroyed three of four guns.

Artillery unit of Longues-sur-Mer Casemate with gun Casemate with gun The back side of a gun
The front post From here the coordinates were given to the artillery Gold Beach