Shaft, sinking, with cases, 152-4 Shaft, sinking, with frames and sheeting, 141-5 Shaft in a lodgement, 170 Shallow sap, 31 Shelters and huts, 113 Shield for covering ditch, 38-40 Shield for driving gallery, 147 Shovel and pick, miner’s, 136 Siege, definitions, etc., 12, 64 Siege batteries, 42-53 Siege, first period of, 65, 103 Siege, second period of, 75, 106 Siege, third period of, 86, 107 Siege, length of, 71 Siege of Belfort, Fort Wagner, Paris, Plevna, and Strasburg, 71, 86, 104 Simple trench, 20 Sinking shaft with frames and sheeting, 141-5 Sinking shaft with cases, 152-4 Sinks and latrines, 115 Slope, defined, 119 Slope-block, 137, 148 Slope, change of, 149, 155 Slope, method of fixing, 147 Squibs, 178 Splinter-proofs, 23, 48, 56 Sterilizing water, 117 Stockades, demolition of, 182 Strasburg, siege of, 71, 86 Sunken battery, 45-53 Supplies and provisions, 101 Surprise, 2 Surprise, defence against, 4 Surrender of the place, 109 T Tamping blasts, 178-9 Tamping mines, 166 Third period of siege, 86 Todleben’s rules, 173 Tools and appliances, 10, 136 Tracing approaches, 18 Tracing a battery, 47