The main armament were three Czechoslovakian 21 cm Kanone 39 cannons, two of which housed in heavily fortified casemates up to 10 feet thick of concrete.[3] Due to ordnance supply problems, the site instead consisted of three 210-mm navy guns, with only two of them protected by large concrete casemates, a command post, shelters for personnel and ammunition, and several defensive machine-gun emplacements.Infanterie-Division (709th Infantry Division) for ground defense under the command of Leutnant Geissler, which brought the overall manpower of the battery close to 400 men.He immediately reported his observation to the Kriegsmarine headquarters at Cherbourg, which triggered the German alarm throughout installations on the Atlantic coast.At 9 a.m. the concentrated fire of the three battleships put the second casemate out of action, when a shell from Nevada pierced the embrasure, killing the entire crew.24, withstood the naval bombardment, but was incapable of reaching targets out at sea; the gun initiated fire at 11 a.m., directed to the beach facing WN 5 Widerstandsnest 5 (Resistance Nest 5), 10 kilometers (6.2 miles).After the first assault they succeeded in entering Saint-Marcouf but were stopped in front of the battery by the 75mm flak guns that had been repaired and were put in firing positions against ground targets.Ohmsen took advantage of the situation and counterattacked with the support of Leutnant Geissler's 6th company, and pushed the Americans back to Dodainville (roughly 1.2 kilometers (0.75 miles) south-southeast of the battery).
Ohmsen on 14 June 1944
Two near misses from the shore batteries against USS
Corry
.