Built on a cliff at Longues-sur-Mer, the formidable German battery included four fearsome 150mm canons, capable of firing on targets 20km away. It took a hammering of 600t of bombs by the Royal Air Force and two hits by the French cruisers Georges-Leygues and Montcalm and the American battleship Arkansas to destroy it once and for all, on 6 June 1944. The battery's observation and command post was the backdrop for one of the most famous scenes of the film The Longest Day.