Tracing lanterns, pickets, tapes, etc., 14 Tracing parallels, 17 Transverse galleries or transversals, 170 Traverse by blinded sap, 35 Traverse, cube, 34 Traverses, length of, 34 Traversed sap, 33 Trenches, 15 Trench cavalier, 36 Trenches, guard of the, 15 Trench, infantry, 104 Trench, simple, 20 Tunnels, demolition of, 183 U Underground warfare, 169 V Vauban’s maxims, 94 Ventilation of mines, 158-60 Vertical fire, batteries for, 83 Volume and form of craters, 121 Volume and weight of charge, 161, 181 W Wagner, Fort, siege of, 86 Walls, demolition of, 181 Water-supply, 116 Weight and volume of charge, 161, 181 Wet ditch, passage of, 38-40 Working drawings, 151 [Illustration: _Plate I._ _Bradley & Poates, Engr’s, N. Y._] [Illustration: _Plate II._ _Bradley & Poates, Engr’s, N. Y._] [Illustration: _Plate III._ _Bradley & Poates, Engr’s, N. Y._] [Illustration: _Plate IV._ _Bradley & Poates, Engr’s, N. Y._] [Illustration: _Plate V._ _Bradley & Poates, Engr’s, N. Y._] [Illustration: _Plate VI._ _Bradley & Poates, Engr’s, N. Y._] [Illustration: _Plate VII._ _Bradley & Poates, Engr’s, N. Y._] [Illustration: _Plate VIII._ _Bradley & Poates, Engr’s, N. Y._] [Illustration: _Plate IX._ _Bradley & Poates, Engr’s, N. Y._] [Illustration: _Plate X._ _Bradley & Poates, Engr’s, N. Y._] [Illustration: _MILITARY MINING Plate XI._ _Bradley & Poates, Engr’s, N. Y._] [Illustration: _MILITARY MINING Plate XII._ _Bradley & Poates, Engr’s, N. Y._] BOOKS FOR ARMY AND NAVY OFFICERS PUBLISHED BY JOHN WILEY & SONS.