Sir John French is a figure who has always aroused controversy. Douglas Haig despised him, while Churchill thought his leadership qualities unsurpassed. Despite being the most capable cavalry leader of his generation, posterity has judged him an unfeeling butcher, responsible for more deaths in the first two hours of the battle of Loos than all the casualties on both sides in the 1944 D-Day landings. But there was another side to French, which is...