That night at 8 o'clock the Sergeant in charge came around and detailed eight of us to go up to the sap,--Mac, Skinny, and I were among those chosen,--so we started off to a place known as "S. P. 13" (Strong Point No. 13). Skinny was in the lead, as he had been there before. We went through about a mile and a half of communicating trench, and there we encountered three or four infantrymen bound for the front lines. The bullets were whizzing over our heads, and once in a while a shell dropped near us, but nothing happened till we had to come up out of the trench and cross an open space. The infantrymen were in the lead, and almost as soon as we struck the open one of them "got it" in the head. Skinny was in front of me, and he stopped so suddenly that I said, "What's wrong, Skinny?" He said, "Blime, but he's got it; I wonder how many blinkin' kids the poor devil's left." The poor lad was killed instantly and we picked him up and laid him on one side with his cap over his face--the stretcher bearers would find him and carry him back of the lines. We continued on our way, and Skinny, paying no more attention to flying bullets than he would to flies, led us to the sap where we were to begin work. At the entrance to this particular sap was an immense shaft leading down 107 feet, and shooting out from this shaft were two main tunnels--these tunnels were four feet high and about three in width, and they ran under "No Man's Land" and past the first line of German trenches, the object being to reach a small wood and lay a mine under some pill-boxes that were causing us a lot of trouble. These pill-boxes were machine gun emplacements made of concrete, and our heavy shells had no effect on them. Our only chance of getting them was to blow them up with a mine. When I went in, there was still quite a distance to go, for the wood lay behind the second line of German trenches.