The Underground War: Vimy Ridge to Arras by Phillip Robinson, Nigel Cave
Published by Pen & Sword Books on July 19th 2011
Len's Summary: Part one of a planned four-part work on tunneling on British stretch of the Western Front. Reflects recent work on the Durand Group; with an illustrated tours section. // Both sides made extensive use of tunneling to place mines beneath opponent’s defensive works, a practice dating back to the invention of gun powder. First volume in a planned four-volume series.