the schleswig holstein battery from hel, (german unit mkb 2 / maa 119) in france, renamed battery lindemann (german unit mkb 6 / maa 244), saw considerable service. the three guns were emplaced singly in turrets, protected by massive concrete encasements in places four metres thick. the battery fired 2,226 shells at dover between 1940 and 1944. the guns were not put out of action by bombing despite being hit many times, thanks to the thick concrete. only the bruno turret was damaged, on 3 september 1944, when a shell from a british railway gun hit its elevating gear; the battery was captured shortly afterwards.