The coastal artillery along the Normandy coast was designed to provide interlocking fire. It should be noted that the only batteries illustrated here are the army and navy coastal artillery batteries in range of the D-Day beaches. There were additional coastal batteries on the Cotentin coast northwest of Utah Beach, but not within range. The army's divisional artillery batteries are not shown here for clarity.
Nearly all of the batteries shown here were under army control, including two batteries that had been constructed and manned by the Kriegsmarine at Saint Marcouf/Crisbecq and Longues-sur-Mer.
The exception was 2/MAA.266 near Bleville-Ia-Corvee with its massive turreted 380mm gun from the cruiser Jean-Bart. Three of these guns were planned but only one was complete by D-Day. Although this gun could reach the D-Day staging areas and the beaches themselves, in reality the lack of fire control beyond the horizon limited its utility at such extreme ranges. The same was true of the 3/HKAA.1254 battery of three 170mm K 18 guns at C1os-des-Ronces, which were at the fringe of the D-Day beach staging areas.
The most powerful of the batteries to the west was 3/HKM.1261 in Crisbecq near Saint Marcouf, with four casemated Skoda 210mm K39/40 guns, two of which were
in H683 casemates. This battery engaged in a duel with Allied destroyers off Utah Beach. Within the more immediate area of the beaches, several of the batteries had taken such a pounding during the preliminary air and naval bombardments that their guns had been pulled back days before including the batteries at Riva Bella and Pointe-du-Hoc. I/HKM.1261 at St Martin-de-Varreville had four 122mm guns in open positions and were heavily shelled by HMS Hawkins on D-Day so never went into action. It was taken later in the day by troops of the 101st Airborne Division. The batteries that did engage Allied ships on D-Day included the Longues-sur-Mer battery between Omaha and Gold Beaches and the Houlgate battery of 3/HKM.1255, which was armed with three 155mm K420f guns. The Houlgate battery was initially silenced by fire from HMS Ramilles, but the battery subsequently engaged HMS Warspite and was again brought under heavy naval fire.