The bunker was built in 1943/44, on a special design. I fact, as the coast was very low, the Organization Todt had to erect the 17 meters tower to increase the range finder’s range. This was the Fire Control post of the defenses of the river Orne estuary and the canal entrance. These consisted in six 150 mm french guns, on the beach of Riva-Bella, served by men of the 1st Battery, 1260th Coastal Artillery Batallion and four 150 mm french guns, near the water-tower, served by gunners of the 4th Battery, 1716th Artillery Regiment, 716th Infantry Division. On june, 6th , it received a lucky direct hit, fired from a 380 mm gun of the H.M.S. Frobisher battle cruiser which made the Bunker unoperational. During the morning, british troops of the n° 4 Commando were intrigued by this unforeseen concrete tower. They made two attempts to get inside without success. They were content to withdraw with their wounded men.The Bunker was finally captured by the lieutnant Bob Orrell who took 53 prisonners, on june, 9 th. He was promoted captain the next day.