Plan
The purpose of the raid was to destroy three objectives: the Normandie dock, the old gates into the Basin de St Nazaire together with the water pumping machinery and other installations, and any U-boats or other shipping in the area. The initial Combined Operations plan required two specially lightened destroyers to carry out the raid. The first would be packed with explosives and rammed into the dock gates. Commandos on board would then disembark and use demolition charges to destroy nearby dock installations, searchlights and gun emplacements. The destroyer would then be blown up, and the second ship would come in and evacuate the ship's crew and the commandos. At the same time the RAF would carry out a number of diversionary air raids in the area.
When the plan was presented to the Admiralty, they refused to support it. The certain loss of one or both destroyers to eliminate the dry dock was out of the question. They suggested they could provide an old Free French ship, the Ouragan and a flotilla of small motor launches to transport the commandos and evacuate them afterwards. Approval for the mission, codenamed Operation Chariot, was given on 3 March 1942. Using a French ship would involve using the Free French forces and increase the number of people aware of the raid. Consequently it was decided the navy would have to provide a ship of their own. The RAF complained that the raid would draw heavily on their resources; the number of aircraft assigned by RAF Bomber Command was reduced time and again before the day of the raid. British Prime Minister Winston Churchill further complicated matters when he ordered that bombing should only take place if targets were clearly identified.
Combined Operations Headquarters worked closely with several intelligence organisations to plan the raid. The Naval Intelligence Division compiled information from a variety of sources. A detailed plan of the town of St Nazaire was provided by the Secret Intelligence Service, and information on the coastal artillery nearby was sourced from the War Office's Military Intelligence branch. Intelligence about the dock itself came from pre-war technical journals. The RN's Operational Intelligence Centre selected the route and timing for the raid based on intelligence about the location of minefields and German recognition signals sourced from Enigma decrypts and knowledge of Luftwaffe patrols compiled by the Air Ministry's Air Intelligence Branch. When all the plans had been pulled together and the timing worked out, the raid was expected to last no longer than two hours. The commandos and crew from Campbeltown would board the motor launches at the Old Mole jetty and then return to base.
Read more about this topic: St Nazaire Raid
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