“Crisbecq” was one of the first batteries to open fire the morning of June 6 on Utah. With the exception of the Cherbourg Fortress and the fortifications in Le Havre, the naval battery at Crisbecq was the most powerful one in the entire Seine Bay and represented the cornerstone of German defences in this sector. Built in the winter of 1943-44, it was armed with four 210-mm SKODA guns, of which only two had been installed in casemates by D-Day. Until it was silenced on June 8th, Crisbecq Battery posed a very real threat to troops landing on Utah Beach. Rapidly encircled by the Americans, the garrison of 400 soldiers, commanded by Sub-Lieutenant Ohmsen, resisted vigorously for several days. The survivors managed to escape to the German lines in the night of June 11th-12th. The two huge casemates, which can still be seen today, near the impressive range-finding post, were damaged not by the frequent aerial bombardments to which the battery was subjected from spring 1944 onwards, but by experiments conducted by American engineers after the battery had been captured to test their resistance to explosives. When the battery was captured on June 12th the casemates were practically intact. After the capture of the batteries, units Of the U.S. engineer corps undertook attempts to destroy the two large casemates by experimenting with explosives, they placed explosives in the two munitions rooms behind the casemate. The explosion caused the almost total destruction of the rear of the classmate and the whole of the roof completely caved in. The front part was hardly affected by this explosion. The rear of the same casement after the experiments done by the U.S. engineer corps. The interior of the Firing Command Post was also destroyed by the U.S engineer corps thru experimenting with explosives, the anti-aircraft defence post on top of the C.P was partly destroyed by the explosion of munitions stored in one of the munitions armories, a powerful charge in the basement caused a hole in the floor of the upper room and smashed the stairway and the partitions The basement is now constantly filled with water, and entry to the C.P is closed to the public for safety reasons. On my last visit i was informed by a guide that while doing their testing it actually caused the death of a dozen of Americans. Thou i am unable to find confirmation about this!