onvoys, 123-124

-- -- attacks on, 124

Scapa Flow, 103

Scottish waters, mine-fields in, 147

Sea fight, elements of, 255

-- flanks of armies, 286-300

-- power, elements of, 26

-- stalking, 270

Seamanship classes, 41-43

Searching for mines, 162

Shallow-water sweeping, 162

Shell-shock cases, 257

Ships of the new navy, 20-22

Sick bay, shells burst in, 256

Singapore mine-field, 145

Sinking of last U-boat, 99

Sloop flotillas, 52

Smoke screens, 92-93, 290

S.O.S., 238

Sounds, submarine, 70-73

South African mine-fields, 145

_Southampton_, H.M.S., 255

Southampton Water training ground, 38

Spanish Armada, 233

Spectre of the Goodwins, 265

Spotting officers at Zeebrugge, 288-291

Staff Headquarters, 24

Standard ships, 120

_Submarine Engineering of To-day_, 154

Submarine hide-and-seek, 77-78

-- nets, 258-263

-- phase of naval war, 17-20

-- sounds, 70-73

-- _v._ submarine, 140

-- _v._ merchantman, 19

-- warfare of the future, 127

Sutphen, Henry R., 57-58

_Sydney_, H.M.S., 123

TACTICAL methods, 134-135

Task of Allied navies, 18-35

Tenth Cruiser Squadron, 52, 232

Theatre of war, principal, 20

Thornycroft, Messrs John T., & Co. Ltd., 65

Tides, effect of, on moored mines, 149

-- -- on minesweeping, 171

Toast of the British Navy, 48

Tracking U-boats, methods of, 129-131

Training an anti-submarine force, 36-49

Transport of Allied armies, 116

Trawler units, 54, 55, 113

Treachery, guarding against, 270

Tripods (for observation) at Zeebrugge, 280

U-BOATS, fishing for, 87-88, 258-263

-- sunk, 263

-- sunk by Q19, 97-100

U-C boats, 144

United States, effect on German mine-laying, 156

-- help from, 21

-- navy, 69

-- warships attacked, 125

University, a naval, 46-49

Unrecorded sea fights, 204