Henry Wilson was the only British field marshal ever to die in action, killed on his own doorstep in 1922 by two IRA men (one of whom had a wooden leg). Wilson was a flamboyant, maverick Irishman, at the centre of affairs during the First World War years and after, recording everything in his wildly indiscreet diary. Using a wide range of official and private sources, this is the first modern biography of this controversial and misunderstood figure.