An important official publication covering all aspects of subterranean warfare with much practical detail for the guidance of mining companies of the Great War. Contents: Subterranean Warfare. Shafts and Galleries. Countermines. Ventilation and Lighting of Galleries. Charges and Effects of Mines. Preparing Mines for Firing. Firing Powder Charges without Electricity. Firing Charges by Electricity. Boring and blasting. Explosives. Demolitions with Gunpowder. Demolitions with Guncotton. Demolition of Railways. Demolitions of Telegraph Lines.