August 24, 1940 took command of the ship's final decision Kriegsmarine, and over the 'Bismarck' was hoisted flag with a swastika – the battleship was commissioned the German Navy. Commander of the ship was named Ernst Lindemann. The very next day standing at the pier the ship was raised first air raid alert. There has been a shooting anti-aircraft guns, but it ended without any consequences. Before the operation 'Reynbung' (see below) on the 'Bismarck' was raised four air alarm. 'Bismarck' first went to sea September 15, 1940. Upon reaching the destination, given the battleship anchored in the roads Brunsbettel. September 16 the ship was towed through the Kiel Canal in Kiel, and arrival of the battleship moorings in the harbor gave Sheerhafn.
This was followed by sea trials in the Baltic Sea in October-November 1940. December 9, 1940 'Bismarck' was in Hamburg, where he was prepared for the voyage, followed by return to Kiel, where the ship moored at the dock number 9 shipyards 'Deutsche Veerke'. The battleship was made loading ammunition, water, food. Also on board were taken two catapult seaplanes 'Arado-196'. From 18 March to 1 April 1941 in the Baltic Sea were routine tests before the first battleship battle campaigns. The next day, the 'Bismarck' took two more 'Arado-196'. May 5, 1941, two weeks before the start of the operation 'Reynbung', 'Bismarck' visit to the Fuhrer Third Reich, Adolf Hitler, accompanied by Field Marshal Wilhelm Keitel and Admiral Gunther Lyutens. Visit was accompanied by 4 hours.