 Complete the following phrase:  The huge Joubert drydock built for SS Normandie was the only port on the Atlantic capable of servicing the German battleships and . This made the port strategically important to both the Axis Powers and the Allies during World War II. After Operation Rheinübung on 1827 May 1941, in which Bismarck and the heavy cruiser which resulted in the sinking of and the sinking of Bismarck, the need for the Allies to take the Joubert dry dock out of operation was increased. The Bismarck and the Tirpitz were to have ended their raid at Saint-Nazaire. On 28 March 1942, a force of 611 British Commandos and the Royal Navy launched the 