Charge, excess to be used in demolitions, 184 Charge for over- or under-charged mines, 125 Charge for blasts, weight determined, 179 Charge for blasts, when tamped, 178-9 Charge for common mines, 122-4 Charge for mines, placing, 165 Charge for mines, preparing, 161 Choice of explosives, 132 Churn-drill, 178 Circular place of arms, 31 Conquered place, occupation of, 93 Common mine defined, 120 Common mine volumes and charges, 120-4 Construction of battery for field-guns, 43 Construction of battery, sunken, 48-50 Construction of central passage, 48 Construction of magazine, 60 Construction of simple trench, 20 Construction of trench by flying sap, 22 Counter-battery, 82 Cover for bomb and splinter proofs, 23-25 Cover for magazines, 58 Covered way, crowning of the, 35 Crater, definitions, 119 Crater, assumed form of, 121 Crater relation between volume and charge, 120-7 Crater radius, definition, 119 Crowning the covered way, 35 Crutch, 154 D Dampness, precautions against, 63 Defence, the, 99-111 Defence against assault, 7, 105 Defence against bombardment, 10, 105 Defence against surprise, 4 Defence, ammunition for, 101 Defence, armament for, 100 Defence by mines, 171-2 Defence, council of, 98 Defence during bombardment and assault, 105 Defence during first period, 103 Defence during second period, 106