U-Boats, various types of, (see also Submarines, German) Unescorted ships, losses by submarine attack in 1917, United Kingdom, the, approach areas for traffic to, coast divided into areas for patrol and minesweeping, United States Navy, a detachment dispatched to Gibraltar, co-operation with British Navy, In 1917, United States, the, a new type of mine produced in, United States, the, and the convoy system, declares war on Germany, rate of ship production in, (See also America) "Unrestricted submarine warfare," object of, opening of, _Vengeance_, experimental tests in, Villiers, Captain Edward C., net protection device of, Warship production in 1917, Watt, I., skipper of _Gowan Lea_, Webb, Captain Richard, in charge of Trade Division, Wemyss, Vice-Admiral Sir Rosslyn, becomes Deputy First Sea Lord, Chief of Naval Staff, Whalers and their work, White Sea, the, British naval work in, Whitehead, Captain Frederic A., Director of Mercantile Movements Division, Wilde, Commander J.S., Wilson, Admiral Sir Arthur, anti-submarine measures of, Wireless, importance of, in convoys, provided for the Mercantile Marine, patrol work of, Zeebrugge, aerial bombing attacks on, bombardment of, Zeppelin assists in a hunt for a British submarine, End of the Project Gutenberg EBook of The Crisis of the Naval War by John Rushworth Jellicoe