He crept inside and drew his knees up to his chest so that his feet were well out of reach. At his suggestion I tried to use the active service alarm clock on him, but there was not room enough in which to wield it. My feet were tingling from the effect of his blows, and I felt that the reputation for resourcefulness of Kitchener's Mob was at stake. In a moment of inspiration I seized my rifle, gave him a dig in the shins with the butt, and shouted, "Stand to, Shorty!" He came out rubbing his leg ruefully. "You got the idea, mate," he said. "That's just wot they does w'en you tries to double-cross 'em by pullin' yer feet in. I ain't sure w'ere I likes it best, on the shins or on the feet." This explanation of the reason for building three-sided dugouts, while not, of course, the true one, was none the less interesting. And certainly, the task of arousing sleeping men for sentry duty was greatly facilitated with rows of protruding boot soles "simply arskin' to be 'it," as Shorty put it. All of the dugouts for privates and N.C.O.s were of equal size and built on the same model, the reason being that the walls and floors, which were made of wood, and the roofs, which were of corrugated iron, were put together in sections at the headquarters of the Royal Engineers, who superintended all the work of trench construction. The material was brought up at night ready to be fitted into excavations. Furthermore, with thousands of men to house within a very limited area, space was a most important consideration. There was no room for indulging individual tastes in dugout architecture. The roofs were covered with from three to four feet of earth, which made them proof against shrapnel or shell splinters. In case of a heavy bombardment with high explosives, the men took shelter in deep and narrow "slip trenches." These were blind alleyways leading off from the traveling trench, with room for from ten to fifteen men in each. At this part of the line there were none of the very deep shell-proof shelters, from fifteen to twenty feet below the surface of the ground, of which I had read. Most of the men seemed to be glad of this. They preferred taking their chances in an open trench during heavy shell fire.