Below the shattered ground that separated the British and German infantry on the Western Front in the First World War, an unseen and largely unknown war was raging, fought by miners, ‘tunnelers’ as they were known. They knew that, at any moment, their lives could be extinguished without warning by hundreds of tons of collapsed earth and debris. Australian tunneling companies took part in the battles of Fromelles, Arras, Messines, Passchendaele, Cambrai, the defense of Amiens, Lys, and the famous last 100 days. Crumps and Camouflets, is the first complete history of Australia’s role in the tunneling war of 1914-1919, of the men and units in which they served, and of life in the tomblike tunnels of the war underground.