Dr Stephen Bull is Curator of Military History and Archaeology at the Museum of Lancashire, and an extramural lecturer for Lancaster University. He has previously worked for the BBC in London, and at the National Army Museum. He is the author of a dozen military historical titles, and has recently been awarded an MBA.

Adam Hook studied graphic design, and began his work as an illustrator in 1983. He specialises in detailed historical reconstructions, and has illustrated Osprey titles on subjects as diverse as the ancient Greeks, the Aztecs, and the American Revolutionary and Civil Wars. His work has featured in publications and exhibitions throughout the world.

The regular armies which marched off to war in 1914 were composed of massed riflemen, screened by cavalry and supported by artillery; their leaders expected a quick and decisive outcome, achieved by sweeping manoeuvre, bold leadership and skill at arms. Eighteen months later the whole nature of field armies and their tactics had changed utterly. In sophisticated trench systems forming a battlefield a few miles wide and 400 miles long, conscript armies sheltered from massive long-range bombardment, wielding new weapons according to new tactical doctrines. This first of two richly illustrated studies explains in detail the specifics of that extraordinary transformation, complete with ten full colour plates of uniforms and equipment.