k on, IV, 84

Southwest Africa, British conquest of, III, 484-493

Souville, attacks on, V, 368

Spee, Admiral von, II, 230

Speed plane, in warfare, V, 421

Stambuloff, I, 233

Stanislau, operations around, VI, 435

Stanislau, advance on, V, 193;
VI, 72

Steenstraete, capture of, VI, 287

Stokhod River, V, 198-207;
VI, 76-81, 423

Strikes in munitions factories, planned by Germans, V, 10

Strypa River, fighting along, IV, 223-229

Strypa River, Russian artillery attacks along, V, 138

St. Mihiel, French gains, VI, 231

St. Quentin, VI, 236

Stuff Redoubt, VI, 32, 49

Sturmer Boris, VI, 379

Stuttgart, bombardment of, by French aviators, IV, 60

Styr River, IV, 223-229;
V, 178

Submarine attacks on American transports, VI, 358

Submarine campaign, IV, 116

Submarine campaign against merchant ships, V, 59

Submarine, detecting, I, 21

Submarine, effectiveness of, I, 19

Submarine, efficiency of, IV, 145

Submarine negotiations, VI, 193

Submarine warfare, III, 209-222

Submarine warfare, VI, 182-188

Submarine warfare in 1917, VI, 475

Submarine warfare on armed merchantmen, IV, 499

Submarines, aeroplane warfare on, V, 414

Suchomlinof, V. A., I, 320

Suez Canal, defenses of, III, 18-19;
IV, 11

Summary of first year's operation on western front, IV, 39-46

_Sussex_, sinking of, V, 63, 443

Suvla Bay, IV, 346-356

Suwalki, occupation of, II, 448

Talaat Bey, II, 499

Tanks, VI, 21, 46

Tannenberg, battle of, II, 438

Tarnow, battles around, III, 286

Tergovistea, capture of, by Austro-Germans, VI, 117

Terrorism in Russia, I, 153

Thiepval, British successes around, VI, 17

Tigris River, IV, 426;
V, 326-330

Tigris valley, campaign in, V, 307

Tilsit, peace of, I, 84

Togoland, campaign in, III, 62

Townshend, General, V, 311

Trade, foreign, of Germany, I, 49

Transloy, British successes at, VI, 65

Transportation of troops, I, 24

Transports, protection of, I, 18

Trans-Siberian Railway, I, 153

Trebizond-Erzerum road, V, 299

Trebizond, occupation of, V, 297

Trench bombs, I, 76

Trench fighting, I, 68

Trentino, Austrian offensive in, V, 244-255

Trentino front, VI, 15