Following the career of one relatively unknown First World War general, Lord Horne, this book adds to the growing literature that challenges long-held assumptions that the First World War was a senseless bloodbath conducted by unimaginative and incompetent generals. Instead it demonstrates that men like Horne developed new tactics and techniques to deal with the novel problems of trench warfare and in so doing seeks to re-establish the image of the British generals and explain the reasons for the failures of 191516 and the successes of 191718 and how this remarkable change in performance was achieved by a much maligned group of senior officers. This study consequently provides a judgment not only on Horne as a personality, innovator and general of great importance but also on his contemporaries who served with the British Armies in South Africa and France during an era which saw a revolution in military affairs giving birth to a Modern Style of Warfare which still prevails to this day.