Douglas Haig's career is at the center of a debate concerning the nature of the Great War. Traditionalists contend that, like the majority of general from both sides, he was a hidebound relic of a bygone age who could not come to grips with modern war and sent his soldiers "over the top" in futile attacks, with a criminal disregard for the enormous cost in lives. Indeed, under Haig's leadership, the British Expeditionary Force fought its two signature...