Letter from Vice-Admiral Sir John Jellicoe [Commander-in- Chief, Grand Fleet] (HMS Iron Duke) to WSC [First Lord of the Admiralty] on German submarine activity in the North Sea, commenting that Germany had a lead over Britain in ocean-going submarines. Jellicoe warns that it would be foolish to risk big ships in waters infested by submarines, adding that the principal object should be to get rid of German submarines as quickly as possible, using British and French submarines against them. He also asks for more trawlers to be fitted with wireless in order to form a trawler patrol, suggests using the Grand Fleet to shut up the northern entrance to the North Sea and asks for submarine defence at Scapa Flow [Orkney Islands, Scotland].