 Complete the following phrase:  In late November 1940, Becher transferred to the recently launched destroyer as part of the ships commissioning crew. While completing working-up exercises, Napier was tasked with transferring British Prime Minister Winston Churchill and his wife from Thurso in Scotland to the battleship , and later returning them to the mainland. With her working-up complete, Napier was initially posted to convoy duties in the North Atlantic, before setting sail in April 1941 with for the 