Staunch sunk by submarine,
Slonecrop (decoy ship) sinks a submarine,
Strongbow, sinking of,
Submarine attacks on decoy ships,
  campaign of 1917, the,
  danger, the, difficulties of combating,
  detector, an electrical,
  -hunting flotillas,
  warfare, offensive and defensive measures against,
Submarines, British, delay in deliveries of,
  estimated number of enemy sinkings by,
  fitted as minelayers,
  length of time taken in construction of,
  offensive use of,
  operations against enemy submarines,
  production of,
  value of depth charges against,
Submarines, German,
  aircraft attacks on,
  Allied losses by, 1916-17,
  as minelayers,
  devices for circumventing,
  losses of,
Submarines, German, rapid construction of,
  success of, in the Mediterranean,
Swift, action with German destroyers,
Sydney (Cape Breton) convoy, the,
Syrian Coast, the, operations on,

Taussig, Lieut-Commander T.K.,
“Taut wire” gear, value of the device,
Terror, bombardment of Ostend by,
  damaged,
Thames Estuary, mines laid in the,
Torpedo and Mining Department, the
  valuable work of,
Torpedo, the, in general use,
Tothill, Rear-Admiral H.H.D.,
Trade Division of the Naval Staff, the,
“Trawler Reserve,” the,
Trawlers as minesweepers,
  convoy work of,
  delay in deliveries of,
  hunting flotilla work of,
Troop transports, escorts for,
Tyrwhitt, Rear-Admiral Sir Reginald, and his command,

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,