Passage: On 6 March, Bismarck received the order to steam to Kiel. On the way, the ship was escorted by several Messerschmitt Bf 109 fighters and a pair of armed merchant vessels, along with an icebreaker. At 08:45 on 8 March, Bismarck briefly ran aground on the southern shore of the Kiel Canal; she was freed within an hour. The ship reached Kiel the following day, where her crew stocked ammunition, fuel, and other supplies and applied a coat of dazzle paint to camouflage her. British bombers attacked the harbour without success on 12 March. On 17 March, the old battleship Schlesien, now used as an icebreaker, escorted Bismarck through the ice to Gotenhafen, where the latter continued combat readiness training.The Naval High Command (Oberkommando der Marine or OKM), commanded by Admiral Erich Raeder, intended to continue the practice of using heavy ships as surface raiders against Allied merchant traffic in the Atlantic Ocean. The two Scharnhorst-class battleships were based in Brest, France, at the time, having just completed Operation Berlin, a major raid into the Atlantic. Bismarck's sister ship Tirpitz rapidly approached completion. Bismarck and Tirpitz were to sortie from the Baltic and rendezvous with the two Scharnhorst-class ships in the Atlantic; the operation was initially scheduled for around 25 April 1941, when a new moon period would make conditions more favourable.Work on Tirpitz was completed later than anticipated, and she was not commissioned until 25 February; the ship was not ready for combat until late in the year. To further complicate the situation, Gneisenau was torpedoed in Brest and damaged further by bombs when in drydock. Scharnhorst required a boiler overhaul following Operation Berlin; the workers discovered during the overhaul that the boilers were in worse condition than expected. She would also be unavailable for the planned sortie. Attacks by British bombers on supply depots in Kiel delayed repairs to the heavy cruisers Admiral Scheer and Admiral Hipper. The two ships would not be...

Question: What kind of battleships were used for Operation Berlin?
Scharnhorst-class battleships