 Complete the following phrase:  Toward the end of 1941, she was transferred to the North Sea, and went into drydock for her last major modification. This consisted of the installation of a FuMO 21 radar set on the forward command center roof. In July 1942, Köln departed Germany to join the growing naval presence in Norway, though she saw no major action there. On 13 September, she and the heavy cruisers Admiral Scheer and and two destroyers attempted to attack 