At that time the French were making attacks every few days. We were told to abandon the foremost trench should an attack be made. The mines had been laid two days when the expected attack occurred, and without offering any great resistance we retreated to the second trench. The French occupied the captured trench without knowing that several thousands of pounds of explosives lay buried under their feet. So as to cause our opponents to bring as many troops as possible into the occupied trench we pretended to make counter attacks. As a matter of fact the French trench was soon closely manned by French soldiers who tried to retain it. But that very moment our mines were exploded. There was a mighty bang, and several hundreds of Frenchmen were literally torn to pieces and blown up into the air. It all happened in a moment. Parts of human bodies spread over a large stretch of ground, and the arms, legs, and rags of uniforms hanging in the trees, were the only signs of a well planned mass murder. In view of that catastrophe all we had experienced before seemed to us to be child's play. That "heroic deed" was celebrated by a lusty hurrah. For some days one had gained a little advantage, only to lose it again soon. In order to make advances the most diverse methods were used, as was said before. The mining section would cut a subterranean passage up to the enemy's position. The passage would branch out to the right and left a yard or so before the position of our opponent, and run parallel with it. The work takes of course weeks to accomplish, for the whole of the loosened soil must be taken to the rear on small mining wagons. Naturally, the soil taken out must not be heaped in one place, for if that were done the enemy would get wind of our intentions and would spoil everything by countermining. As soon as work is advanced far enough the whole passage running parallel with the enemy's trench is provided with explosives and dammed up. When the mine is exploded the whole of the enemy's trench is covered by the soil that is thrown up, burying many soldiers alive. Usually such an explosion is followed by an assault. The sapping section, on the other hand, have to dig open trenches running towards the enemy's position. These are connected by transversal trenches, the purpose being to get one's own position always closer to the enemy's. As soon as one's position has approached near enough to make it possible to throw hand grenades into the enemy's position the hand grenade sections have to take up their places and bombard the enemy's trenches continually with hand grenades, day and night.