 Complete the following phrase:  HMS Narwhal was a which served with the Royal Navy during the First World War. The M class were an improvement on the preceding , capable of higher speed. Launched on 30 December 1915, the vessel fought in the Battle of Jutland between 31 May and 1 June 1916 and subsequently served in anti-submarine and escort duties based at Cobh in Ireland. During February 1917, the destroyer rescued the crew of the Q-ship , which had sunk and been sunk by the German submarine , and rescued the armed merchantman from , The destroyer was transferred to Devonport during 1918 and, after the 