class="pginternal" tag="{http://www.w3.org/1999/xhtml}a">TAKING OF AN ARTILLERY TOWER

59. THE BASTIONS OF ERRARD DE LE BAR-LE-DUC 60. THE NORTH WORK 61. ONE OF THE BASTIONS 62. SIXTH SIEGE.—GALAS' WORKS OF APPROACH 63.      "        "THE ATTACK ON ONE OF THE BESIEGERS' PLACE D'ARMES 64.      "        "FORCIA'S PLAN OF SIEGE 65. VAUBAN'S DEFENCES 66. VAUBAN'S OUTWORK 67. SECTIONS OF THE OUTWORK 68. TRACE OF THE OUTWORK 69. REVÊTEMENT OF THE BASTIONS 70. SEVENTH SIEGE.—THE THEORETICAL ATTACK OF VAUBAN'S WORK 71.      "             "THE THIRD PARALLEL AND THE CROWNING OF THE COUVERT WAY 72.      "             "CAPTAIN ALLAUD'S ADVANCED WORK 73.      "             "SECTIONS AND INTERIOR VIEW OF THE WORK 74.      "             "CAPTAIN ALLAUD'S CRÉMAILLÈRE WORK 75.      "             "ATTACK ON THE WORKS OF COUNTER-APPROACH 76. ILLUSTRATIONS OF THE PRINCIPLES OF ATTACK AND DEFENCE 77. DITTO 78. DITTO 79. APPLICATION OF THE PRINCIPLE: "WHAT DEFENDS SHOULD ITSELF BE DEFENDED" 80. ILLUSTRATION OF THE ALTERED CONDITIONS NECESSITATED BY ARTILLERY OF LONG RANGE 81. PLAN OF FORTRESS SHOWING HOW THOSE CONDITIONS ARE MET 82. BLOCK PLAN OF THE DETACHED FORTS 83. THEORETICAL PLAN OF A MODERN FORTRESS 84. EMPLOYMENT OF THE POLYGONAL SYSTEM, DETACHED FORTS 85. DEFENSIVE SYSTEM OF GREAT INTRENCHED CAMP

ANNALS OF A FORTRESS.

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CHAPTER I.

THE FIRST RETREAT.

Many winters, as we are told by the old men of the district, have passed since human beings first settled in the land of Ohet, a somewhat extensive valley of varying breadth, traversed by a winding stream running southward till it flows into a great river.

The sides of the valley present a series of hills of moderate height, descending by gentle slopes where it widens, and more abruptly where it narrows. On the