LIST OF ILLUSTRATIONS.

1.[MAP OF THE LAND OF OHET] Frontispiece.
[THE SAPPER] Vignette.
2.[THE OPPIDUM]
3.[RAMPART OF THE OPPIDUM]
4.[GATES OF THE OPPIDUM]
5.[THE NÉMÈDE AND THE DRUIDS' DWELLINGS]
[FIRST SIEGE.—SIGILD AND TOMAR]
6. " "[WOODEN TOWERS OF THE OPPIDUM]
7. " "[ADVANCED WORK OF THE OPPIDUM]
8. " "[ASSAULT ON THE OPPIDUM]
9.[THE TOWN AND CITÉ D'AVON (WAR OF THE GAULS)]
10.[SECOND SIEGE.—THE ROMAN 'AGGER' AND 'VINEÆ]'
11. " "[A STIMULUS]
12. " "[THE MOVABLE TOWER]
13. " "[ATTACK ON THE STRONGHOLD OF THE OPPIDUM]
14.[THE ROMAN PERMANENT CAMP]
15.[GATES OF THE CAMP]
16.[THE GALLO-ROMAN TOWN. CITY JULIANA]
17.[SECTION OF THE RAMPART WALL]
18.[PLANS OF THE NORTH GATE]
19.[VIEW OF THE NORTH GATE]
20.[GENERAL VIEW OF THE GREAT SOUTHERN TÊTE DE PONT]
21.[THIRD SIEGE.—THE AGGER]
22. " "[WORK BEFORE THE EAST GATE]
23. " "[THE 'VALLUM']
24. " "[THE NORTHERN SALIENT]
25. " "[BURNING OF THE WOODEN BRIDGE]
26. " "[THE ATTACK—THE MOVABLE BRIDGE INTENDED FOR CROSSING THE SMALL ARM]
[OF THE RIVER ABONIA]
27. " "[THE AGGER]
28. " "[THE ONAGER BATTERY]
29. " "[THE MINE AND COUNTER MINE]
30. " "[THE BREACH MINE]
31. " "[DEFENCE OF THE BREACH]
32. " "[THE BREACH OCCUPIED BY THE ASSAILANTS]
33. " "[MINING BENEATH THE NORTH-WEST CORNER TOWER]
34. " "[MINING BENEATH THE NORTHERN RAMPART WALL]
35.[THE OLD CASTLE OF LA ROCHE-PONT]
36.[THE CASTLE OF LA ROCHE-PONT OF THE TWELFTH CENTURY]
37.[BIRD'S-EYE VIEW OF THE CASTLE OF LA ROCHE-PONT]
38.[BRETÈCHE OF THE BRIDGE]
39.[FOURTH SIEGE.—THE BURGUNDIAN INTRENCHMENT OF CONTRAVALLATION]
40. " "[NIGHT SORTIE OF THE GARRISON OF THE CASTLE]
41. " "[THE BESIEGERS GET POSSESSION OF THE BARBICAN]
42. " "[THE CAT]
43. " "[THE BOSSON]
44. " "[THE BREACH AND THE BURNING OF THE NORTH GATE]
45. " "[THE TAKING OF THE BAILEY]
46. " "[THE SMALL BOSSON]
47. " "[THE MOVABLE TOWER]
48.[THE TOWN OF LA ROCHE-PONT IS FORTIFIED BY CHARLES THE BOLD]
49.[BIRD'S-EYE VIEW OF THE NORTHERN BOULEVARD AND FRONT]
50.[MASONRY TOWER FOR ARTILLERY]
51.[BIRD'S-EYE VIEW OF BOULEVARD AND RAMPARTS]
52.[TÊTE DE PONT AND CAVALIER]
53.[FIFTH SIEGE.—ATTACK ON THE NORTHERN BOULEVARD]
54. " "[DEFENCE OF THE NORTHERN BOULEVARD]
55. " "[ASSAULT ON THE BOULEVARD]
56. " "[ATTACK OF THE OLD FRONT]
57.[FIFTH SIEGE.—THE OLD NORTH GATE BATTERED BY FIRE ARTILLERY]
58. " "[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]