When his party reached the shallow depression, they moved cautiously along it, and to Ainsley's relief reached the elbow in safety. Here they were a good deal more protected from the German fire than they could be at any point, because from here the depression was fully a couple of feet deep and had its highest bank next the German trench. Ainsley led his men at a fairly rapid crawl along the ditch, until he had passed the point nearest to the mine-crater. Here he halted his men, and with infinite caution crawled out to reconnoiter. The men, who had been carefully instructed in the part they were to play, waited huddling in silence under the bank for his return, or for the fusillade of fire that would tell he was discovered. Immediately in front of the crater was a patch of open ground without a single body lying in it; and Ainsley knew that if he were seen lying there where no body had been a minute before, the German who saw him would unhesitatingly place a bullet in him. A bank of earth several feet high had been thrown up by the mine explosion in a ring round the crater, and although this covered him from the observation of the trench immediately behind the mine, he knew that he could be seen from very little distance out on the flank, and decided to abandon his crawling progress for once and risk a quick dash across the open. For long he waited what seemed a favorable moment, watched carefully in an endeavor to locate the nearer positions in the German trench from which lights were being thrown up, and to time the periods between them.

At last three lights were thrown and burned almost simultaneously within the area over which he calculated the illumination would expose him. The instant the last flicker of the third light died out, he leaped to his feet, and made a rush. The lights had shown him a scanty few rows of barbed wire between him and the crater; he had reckoned roughly the number of steps to it and counted as he ran, then more cautiously pushed on, feeling for the wire, found it, threw himself down, and began to wriggle desperately underneath. When he thought he was through the last, he rose; but he had miscalculated, and the first step brought his thighs in scratching contact with another wire. His heart was in his mouth, for some seconds had passed since the last light had died and he knew that another one must flare up at any instant. Sweeping his arm downward and forward, he could feel no wire higher than the one-which had pricked his legs. There was no time now to fiddle about avoiding tears and scratches. He swung over the wire, first one leg, then another, felt his mackintosh catch, dragged it free with a screech of ripping cloth that brought his heart to his mouth, turned and rushed again for the crater. As he ran, first one light, then another, soared upwards and broke out into balls of vivid white light that showed the crater within a dozen steps. It was no time for caution, and everything depended on the blind luck of whether a German lookout had his eyes on that spot at that moment. Without hesitation, he continued his rush to the foot of the mound on the crater's edge, hurled himself down on it and lay panting and straining his ears for the sounds of shots and whistling bullets that would tell him he was discovered. But the lights flared and burned out, leaped afresh and died out again, and there was no sign that he had been seen. For the moment he felt reasonably secure. The earth on the crater's rim was broken and irregular, the surface an eye-deceiving patchwork of broken light and black heavy shadow under the glare of the flying lights. The mackintosh he wore was caked and plastered with mud, and blended well with the background on which he lay. He took care to keep his arms in, to sink his head well into his rounded shoulders, to curl his feet and legs up under the skirt of his mackintosh, knowing well from his own experience that where the outline of a body is vague and easily escapes notice, a head or an arm, or especially and particularly a booted foot and leg, will stand out glaringly distinct. As he lay, he placed his ear to the muddy ground, but could hear no sound of mining operations beneath him. Foot by foot he hitched himself upward to the rim of the crater's edge, and again lay and listened for thrilling long-drawn minute after minute.

Suddenly his heart jumped and his flesh went cold. Unmistakingly he heard the scuffle and swish of footsteps on the wet ground, the murmur of voices apparently within a yard or two of his head. There were men in the mine-crater, and, from the sound of their movements, they were creeping out on a patrol similar to his own, perhaps, and, as near as he could judge, on a line that would bring them directly on top of him. The scuffing passed slowly in front of him and for a few yards along the inside of the crater. The sound of the murmuring voices passed suddenly from confused dullness to a sharp clearer-edged speech, telling Ainsley, as plainly as if he could see, that the speaker had risen from behind the sound-deadening ridge of earth and was looking clear over its top, Ainsley lay as still as one of the clods of earth about him, lay scarcely daring to breathe, and with his skin pringling. There was a pause that may have been seconds, but that felt like hours. He did not dare move his head to look; he could only wait in an agony of apprehension with his flesh shrinking from the blow of a bullet that he knew would be the first announcement of his discovery. But the stillness was unbroken, and presently, to his infinite relief, he heard again the guttural voices and the sliding footsteps pass back across his front, and gradually diminish. But he would not let his impatience risk the success of his enterprise; he lay without moving a muscle for many long and nervous minutes. At last he began to hitch himself slowly, an inch at a time, along the edge of the crater away from the point to which the German lookout had moved. He halted and lay still again when his ear caught a fresh murmur of guttural voices, the trampling of many footsteps, and once or twice the low but clear clink of an iron tool in the crater beneath him.

It seemed fairly certain that the Germans were occupying the crater, were either making it the starting-point of a mine tunnel, or were fortifying it as a defensive point. But it was not enough to surmise these things; he must make sure, and, if possible, bomb the working party or the entrance to the mine tunnel. He continued to work his way along the rim of the crater's edge. Arrived at a position where he expected to be able to see the likeliest point of the crater for a mine working to commence, he took the final and greatest chance. Moving only in the intervals of darkness between the lights, he dragged the mackintosh up on his shoulders until the edge of its deep collar came above the top of his head, opened the throat and spread it wide to disguise any outline of his head and neck, found a suitable hollow on the edge of the ridge, and boldly thrust his head over to look downwards into the hole.

When the next light flared, he found that he could see the opposite wall and perhaps a third of the bottom of the hole, with the head and shoulders of two or three men moving about it. When the light died, he hitched forward and again lay still. This time the light showed him what he had come to seek: the black opening of a tunnel mouth in the wall of the crater nearest the British line, a dozen men busily engaged dragging sacks-full of earth from the opening, and emptying them outside the shaft. He waited while several lights burned, marking as carefully as possible the outline of the ridge immediately above the mine shaft, endeavoring to pick a mark that would locate its position from above it. It had begun to rain in a thin drizzling mist, and although this obscured the outline of the crater to some extent, its edge stood out well against the glow of such lights as were thrown up from the British side.

It was now well after midnight, and the firing on both sides had slackened considerably, although there was still an irregular rattle of rifle fire, the distant boom of a gun and the scream of its shell passing overhead. A good deal emboldened by his freedom from discovery and by the misty rain, Ainsley slid backwards, moved round the crater, crept back to the barbed wire and under it, ran across the opening on the other side and dropped into the hole where he had left his men. He found them waiting patiently, stretched full length in the wet discomfort of the soaking ground, but enduring it philosophically and concerned, apparently, only for his welfare.

His sergeant puffed a huge sigh of relief at his return. "I was just about beginning to think you had 'gone west,' sir," he said, "and wondering whether I oughtn't to come and 'ave a look for you."

Ainsley explained what had happened and what he had seen. "I'm going back, and I want you all to come with me," he said. "I'm going to shove every bomb we've got down that mine shaft. If we meet with any luck, we should wreck it up pretty well."

"I suppose, sir," said the sergeant, "if we can plant a bomb or two in the right spot, it will bottle up any Germans working inside?"

"Sure to!" said Ainsley. "It will cave in the entrance completely; and then as soon as we get back, we'll give the gunners the tip, and leave them to keep on lobbing some shells in and breaking up any attempt to reopen the shaft and dig out the mining party."