The whole island became a Restricted Area during World War II. The bay at Tobermory became a naval base commanded from HMS "Western Isles". The base and the Restricted Area were under Commodore (later Vice Admiral) Sir Gilbert Stephenson, whose strict discipline and ferocious temper earned him the nickname "The Terror of Tobermory". The base was used to train Escort Groups in anti-submarine warfare. 911 ships passed through the base between 1940 and 1945. Following late 20th century reforms, Mull is now part of the wider area of Argyll and Bute.