Dakar convoy, the, Dare, Admiral Sir Charles, Dartmouth, a successful attack on an enemy submarine off, Dazzle painting for merchant ships, system of, De Bon, Admiral, De Chair, Rear-Admiral Sir Dudley, and the U.S. mission, Decoy ships, and the convoy of merchant shipping, fitted with torpedo tubes, number of enemy submarines sunk by, typical actions fought by, Delay action fuses, Denison, Admiral John, Depth charge throwers, Depth charges, enemy submarine victims to, Deputy Controller of Armament Production, appointment of a, Destroyers, American, in British waters, and patrol craft, number of enemy submarines sunk by, available force in February, 1917 average output of British, enemy flotilla of, intercepted, essential to Grand Fleet, fitted with "fish" hydrophones, heavy strain on, hunting flotillas of, Destroyers, inadequate number of British, of the Dover Patrol, time taken in building, Devonport, gunnery courses for cadets and apprentices at, D'Eyncourt, Sir Eustace T., Directional hydrophones, Directorate of Materials and Priority, creation of, Dover, daily average of mercantile marine passing, enemy destroyer raids on, Dover Patrol, the, an enemy attack on, Sir Reginald Bacon's book on, the Sixth Flotilla and its arduous work, Dover, Straits of, inefficiency of the barrage, minelaying in, passage of U-boats through, Dreyer, Captain F.C., and the defensive arming of merchant ships, appointed Director of Naval Ordnance, energy of, Drift nets, mines fitted to, Drifters, work of, Duff, Rear-Admiral A.L., a tribute to, becomes A.C.N.S., Dunkirk, enemy destroyer raids on, Royal Naval Force at, and their work, _Dunraven_ (decoy ship), a gallant fight by, Dutch convoy, the, East coast and Norway, trade between, convoyed, East Coast, the, volume of trade on, and difficulty of proper protection of, Electrical submarine detector, the, _Elsie_, English coast towns, destroyer raids on, Escorts for merchant shipping, Ethel and Millie sunk by submarine, Evans, Captain E.R.G.R., of the _Broke_, rams an enemy vessel, Falmouth convoy, the, losses in 1917, Farrington, Captain Alexander, and decoy ships, "Fish" hydrophones, invention of, Fisher, Lord, destroyer programme of, Fisher, Captain W.W., Director of Anti-Submarine Division, tribute to, Fitzherbert, Rear-Admiral the Hon. Edward, appointed Director of Torpedoes and Mines, "Flares," for night illumination of minefields, Folkestone-Cape Grisnez mine barrage, Ford Company, the (U.S.A.), France, the Staff organization at G.H.Q. in, Fremantle, Rear-Admiral Sydney, French, Sir John (Field-Marshal Viscount), French Admiralty, the, cordial co-operation with Allies, French coal trade, the, convoy of, losses in 1917, Fuller, Captain C.T.M., Funakoshi, Admiral, Japanese Naval Attache in London, _Furious_ converted into a seaplane carrier,