I blogged last month about my pleasure in reading General Gordon's diary from Khartoum while I was researching my novel Pharaoh, and how I particularly relished his attention to detail - describing everything with an engineer's eye, and calculating quantities and distances as closely as possible. One great advantage of this was that I knew that I could rely on his sketch maps as a basis for the maps that my publisher Headline created for the novel, both of which are reproduced here along with a printed original from Gordon's diary - in the case of the larger-scale map of Egypt and the Sudan, with additional detail derived from the equally dependable maps in the official history of the Royal Engineers in the Nile campaign. I used Gordon's own range-finding as a basis for calculating the distance across the Nile between the North Fort and the Governor's Palace, one of crucial significance in my novel in the final fateful hours of Gordon's rule in Khartoum before the forces of the Mahdi break through into the palace compound and Gordon makes his last stand.