He had for his chief of staff Sir John Harington, and beyond all doubt this general was the organizing brain of to Second Army, though with punctilious chivalry he gave, always, the credit of all his work to the army commander. A thin, nervous, highly strung man, with extreme simplicity of manner and clarity of intelligence, he impressed me as a brain of the highest temper and quality in staff-work. His memory for detail was like a card-index system, yet his mind was not clogged with detail, but saw the wood as well as the trees, and the whole broad sweep of the problem which confronted him. There was something fascinating as well as terrible in his exposition of a battle that he was planning. For the first time in his presence and over his maps, I saw that after all there was such a thing as the science of war, and that it was not always a fetish of elementary ideas raised to the nth degree of pomposity, as I had been led to believe by contact with other generals and staff-officers. Here at least was a man who dealt with it as a scientific business, according to the methods of science--calculating the weight and effect of gun-fire, the strength of the enemy's defenses and man-power, the psychology of German generalship and of German units, the pressure which could be put on British troops before the breaking-point of courage, the relative or cumulative effects of poison-gas, mines, heavy and light artillery, tanks, the disposition of German guns and the probability of their movement in this direction or that, the amount of their wastage under our counter-battery work, the advantages of attacks in depth--one body of troops “leap-frogging,” another in an advance to further objectives--the time-table of transport, the supply of food and water and ammunition, the comfort of troops before action, and a thousand other factors of success. Before every battle fought by the Second Army, and of the eve of it, Sir John Harington sent for the war correspondents and devoted an hour or more to a detailed explanation of his plans. He put down all his cards on the table with perfect candor, hiding nothing, neither minimizing nor exaggerating the difficulties and dangers of the attack, pointing out the tactical obstacles which must be overcome before any chance of success, and exposing the general strategy in the simplest and clearest speech.