App.Objectives, difficulty of locating,42,56,71Objects, secondary,77Offensive measures,16,17,43,262Officers, choice of,106,107Orders—art of writing,66,67the drafting of the,66,67,140,156,166Osborne, Commander E. O. B. S., R.N.,178Ostende—attack on, in 1798,54,55,56description of,9,10,11,12difficulty of locating entrance,42,71reason for blocking,42reason for omitting story,41,42Outhwaite, Sub-Lieut. C., R.N.V.R.,219Patrol craft, German,40,96Peace,266Period available for attack,134Personnel, remarks on behaviour,263,264selection of,102ff.training of,112,125,126Phoebe, H.M.S.,220-224;App.Photography,129,130,246Plan—credit for,17,18,19how built up,262inception,17,18,67history of,17,18,67,68modifications of,65previous suggestions,17,70various stages of,64ff.,72,76Plans department,17,67Poison gas,60Port Arthur, attempts to block,54,56,58Postponement, first,148second,154Power, Rear Admiral L. E., R.N.,100Preparations—preliminary,125ff.final,145,167,168Preservation of life,87Prince Eugene, H.M.S.;App.Printing the orders,140Puerto Cabello, attack on, in 1799,54Pyrotechnic Brigade,194Rain, effect of,171,172,173Rescue of men from Mole,218Rescue work,87,88,89,132,229ff.,244-249vessels,84Results—material,249-253moral,255-260Retirement,132,252-260Rigby, Lieut. Charles N. B., R.M.A.,191,192Robinson, Lieut. J. W., R.N.V.R.,224Robinson, Lieut. O., R.N.V.R.,224Rocket apparatus,194Rodman, Rear Admiral Hugh, U.S.N.,107,108Rosoman, Lieut.-Comdr. R. R., R.N.,176,184,188,238,239,242,259Roux, French destroyer;App.Royal Air Force—61st Wing,85,13065th Wing,85,146Royal Naval Reserve,130,263Royal Naval Volunteer Reserve,130,263Rufigi River, attempt to block,54St. George for England,169Salvage—effect of silt on,23,24,25,28,51German attempts,251importance of,44,45previous experience,25remarks on,25,26,44ff.,251,252Sandford, Lieut-Comdr. F. H., R.N.,213,214Sandford, Lieut. R. D., R.N.,210,211,213Santiago, attempt to block in 1898,54,56,58Scott, H.M.S.;App.Seamanship, importance of,41,57,58Seaplane base, German,12Secrecy,100,111,120,121,155Secret, divulging the,108,119,120Shoals,7,41Siege guns,84Signalling difficulties,137,138Silt, description,23,24effect of,24,28,51Sirius, H.M.S.,70,143,246;App.Smith, Petty Officer, R.N.,209Smoke, artificial—limitations of,59,60,99use of,59,60,83,99,100,175,176,208,216,217,218,246Smoke-screen vessels,83,175Sneyd, Commander R. S., R.N.,226,228,229,235Souvenir hunters,248Staff, operational duties,66,67,139Star shell,38,175Stonewall Jackson's maxim,60,61Stork, H.M.S.;App.Storming the Mole,186,187,188,200-204,213Submarines—attack on viaduct,82,100defensive use,40German,4,40shelters,10,11Submarines—C1,210,211,214;App.C3,210-211,213,215,224;App.Success, chances of,54,62Supporting squadrons,146Surprise,59,60,61,262Surveys,7,91Swift, H.M.S.;App.Swin Deep,118,153Synchronisation of events,137,138,170Teazer, H.M.S.;App.Tempest, H.M.S.;App.Teneriffe, Nelson's attack on—in 1797,54,55Termagant, H.M.S.;App.Terror, H.M.S.,174;App.Tetrarch, H.M.S.;App.Thetis, H.M.S.,70,143,171,226ff.,233;App.Tidal stream—description,7,24,30,74effect,24,92,174,183Tide, rise and fall,8,48,49Tigris River, blocking of,58Time factor,137-139Time table,138,156Tomkinson, Captain Wilfred, R.N.,220Towing—necessity for,142ofIrisandDaffodil,142,143,173Trench raid, analogy,112,113,265Trident, H.M.S.,224,245;App.Truculent, H.M.S.;App.Ulleswater, H.M.S.;App.United States—battle squadron,107personnel,107,108Velox, H.M.S.,224;App.Viaduct—attack on,194,195,210-215description,23,25,82,83Vindictive, H.M.S.—anchoring,184attack on Ostende,247choice of,76,126command of,114damage,181,182,198,238,239,241,255,256fitting out of,77-79,100,110position at Mole,128,129,202,203proceedings of,143,148,150,170,173,176,179ff.,200ff.retirement of,230ff.Visibility,136,165Volunteering—for danger,89,122-125,189,202how arranged,104,105,122,123Von Capelle, Admiral,158Walcheren expedition,156Walker, Lieut. H. T. C., R.N.,190Warwick, H.M.S.,144,168,173,220,221,222,233,243;App.Weather, vagaries of,41,93,246Weller, Major B. G., R.M.L.I.,202Welman, Lieut. A. P., R.N.,217Wemyss, Admiral Sir Rosslyn, R.N.,157Whirlwind, H.M.S.,224,230;App.Wind, importance of direction,60,131,176Wounded, behaviour of,196,197Youlton, Petty Officer, E. G., R.N.,238,242Young, Lieut.-Comdr., R.N.V.R.,225Yser Canal,7Zeebrugge,7,8,9,11batteries,28,29,31,33craft based at,11,32German belief in security at,33,34German constructions at,26,28,29canal,10,22canal lock,22,29,43,44,49navigable channel,28,49obstruction and boom,32,33,41,227tidal harbour,22village,22Zeebrugge Mole, description,22,23,24,26,27approach to,27-30attack on:seeStorming the Molebuildings on,26,28,29,32,183currents alongside,30garrison,32,81,82lighthouse extension,27outer wall,26-28,73,74,76peace use,22seaplane base,29,32souvenir,244,245viaduct,23,25Vindictive'sposition,128,129,202,203war use,29,30Zero time, meaning and object,170,173Zone of fire, German batteries,30Zubian, H.M.S.;App.