 Complete the following phrase:  Enlisting in the Royal Naval Volunteer Reserve on 22 August 1914 and commissioned in September, he served in a wide variety of theatres and actions in the First World War, including the Grand Fleet at Scapa Flow, Harwich light cruisers, Admiral Troubridges mission to the Danube, naval siege guns at Flanders, the Zeebrugge Raid in which, commanding a rear gun on , he was severely wounded, necessitating the amputation of his right arm, and, finally, in the 