Spoil, for the benefit of the uninitiated, is the technical name given to the material they remove from the centre of the earth during the process of driving their galleries. It is brought up to the surface in sandbags, and is then carried away and dumped somewhere out of harm's way. In reality it is generally stacked carefully in the trenches themselves, thereby completely blocking all traffic; which is by the way.
But after mining has been in progress for some time, and various craters have been blown and sapped out to, and after trench mortars have "strafed" consistently for many months and torn the original surface of the ground to pieces, the actual position of the trenches themselves becomes haphazard. They cease in many cases to bear the slightest likeness to the ordinary trenches of commerce; they become deep gorges in mountains of sandbags. I have sometimes wished that those officers who apparently write home to devoted bands of female workers asking for more sandbags would get in touch with me instead. I shall be delighted to let them have anything up to five million, all filled, by return; which is again by the way.
To return to Percy. In his part of the front sandbags grew like pebbles on a shingly beach; and from time to time fresh cuts off the trenches were opened to allow for further expansion in the sandbag family. The existing front line in one place had started life as a cut off the old trench, and had gradually been taken into use as a permanency, and it was at this point
