piercing the black dark, a grunt of surprise from the pick-wielder at the lack of resistance to his stroke. All this was just what he had expected, had known would happen. The next stroke would show the digger that he was entering some hole. Then there would be cautious investigation, the sending back word to an officer, the slow and careful enlargement of the opening. And before that moment came the Subaltern would be down his tunnel, and outside, and pressing the switch . . . But his programme worked out no further than that first instant and that first gleam of light. He saw the gleam widen suddenly as the pick was withdrawn, heard another quick blow, saw the round spot of light run out in little cracks and one wide rift, and suddenly the wall fell in, and he was staring straight into the German gallery, with a dark figure silhouetted clear down to the waist against the light of an electric bulb-lamp which hung from the gallery roof. For an instant the Subaltern's blood froze. The figure of the German was only separated from him by a bare three yards, and to his dark-blinded eyes it seemed that he himself was standing in plain view in a brilliant blaze of light. Actually he was in almost complete darkness. The single light in the German gallery hardly penetrated through the gloom of his own tunnel, and what little did showed nothing to the eyes of the German, used to the lamp-light and staring suddenly into the black rift before him. But the German called out to some one behind him, twisted round, moved, stooping, back to the lamp and reached up a hand to it. The Subaltern backed away hastily, his eyes fixed on the glow of light in the opening. The hole had broken through on a curve of his tunnel, so that for fifteen or twenty feet back he could still see down the German gallery, could watch the man unhook the lamp and carry it back to the opening, thrust the lamp before him and lean in over the crumbling heap of earth his pick had brought down. The Subaltern stopped and drew a gasping breath and held it. Discovery was a matter of seconds now. He had left his firing switch, but he still carried the portable telephone slung from his shoulder, the earth-pin dangling from it. He had only to thrust the pin into the mud and he was connected up with the Corporal at the outside switch, had only to shout one word, 'Fire!'--and it would all be over. Quickly but noiselessly he put his hand down to catch up the wire with the earth-pin. His hand touched the revolver-butt in his holster, checked at it, closed round it and slid it softly out. All this had taken an instant of time, and as he raised his weapon he saw the German still staring hard under the upheld lamp into the gloom. He was looking the other way, and the Subaltern levelled the heavy revolver and paused. The sights stood out clear and black against the figure standing in the glow of light--a perfect and unmissable target. The man was bareheaded, and wore a