Thus hastily I have run through the labour of various kinds which was the base and condition of the fighting force. I have left myself room for only a few last words as to that Directing Intelligence which was its brain and soul--_i.e._, the Staff work of the Army--from the brilliant and distinguished men at General Headquarters immediately surrounding the Commander-in-Chief, down to the Brigade and Battalion Staffs, the members of which actually conduct the daily and nightly operations of war from the close neighbourhood of the fighting line. In a preceding chapter I have given a general outline of the duties falling to the Staff of the First Army in the attack on the Hindenburg line. The range and variety of them was immense. But their success, no less than the success of the campaign as a whole, depended on the faithful execution of all the minor Staff work of the Army, from the battalion upward. The skill, precision and personal bravery required from the officers concerned are not as much realised, I think, as they ought to be by the public at home. An officer engaged as a Brigade-Major in the fight on the Ancre, September, 1917, has written me a detailed account of four days' experience in that battle, involving the relief of one brigade by another, and a successful but difficult attack, which gives a vivid idea of Staff work as carried on in the actual fighting line itself. We see, first, the night journey of the four infantry battalions and their machine-gun company and trench-mortar battery, from Albert to Pozières by motor-bus, then the four-mile march of the troops in darkness and rain along a duck-board track, to the trenches they were to relieve. The Brigade-Major describes the elaborate preparation needed for every movement of the relief and the attack, and the anxiety in the Brigade Headquarters, a dug-out twenty feet below the ground, when the telephone--which is constantly cut by shell fire--fails to announce the arrival of each company at its appointed place. Presently, the left company of the battalion on the left is missing. In the darkness, and the congestion of men moving up to and back from the trenches on the narrow track, clearly something has gone wrong. The Brigade-Major sets out to discover the why and wherefore. The attack is to start at 6 A.M., and from 9 P.M. till nearly 5 A.M.--that is, _for close on eight hours_, the Brigade-Major is up and down the track, inquiring into the causes of delay--(a trench, for instance, has been blown in at one point, and the men forced into the mud beside it)--watching and helping the assembly of the troops, and "hunting" for the company which has not arrived, and is "apparently lost." About five he returns to his brigade, hoping for the best.