The Channel Dash or Unternehmen Zerberus (Operation Cerberus) was a German naval operation during World War II.[lower-alpha 1] A Kriegsmarine (German navy) squadron of both of the Scharnhorst-class battleships, the heavy cruiser Prinz Eugen and escorts, ran a British blockade from Brest in Brittany. Scharnhorst and Gneisenau had arrived in Brest on 22 Mar 1941 after the successful Operation Berlin in the Atlantic. Further anti-commerce raids were planned (until late May 1941) and the ships used the dockyard facilities at Brest for refit and repair.