Dale and Corporal Shaw now returned to the spot where the band had been left in hiding, while Max set out for Aix-la-Chapelle alone. He still wore the workman's clothes in which he had masqueraded for so long, and, with his excellent knowledge of the German tongue, he had little to fear so long as he took care not to blunder into a military patrol. Without misadventure he reached Aix, and purchased a dozen spanners similar to those used by plate-layers, except that the handles were short and lacked the great leverage necessary for their work. This difficulty would, however, be easily got over by cutting stout rods from the woods and lashing them to the short spanners. The tools thus obtained would, he knew, be fully suited to the end in view.

The reconnoitring of the railway had disclosed the fact that the guards were stationed only about eighty yards apart. Also that they were changed every four hours, at four o'clock, eight o'clock, midnight, and noon.

An hour before midnight Max led the band towards the line at the point fixed upon. He had already, at some pains, explained exactly what he desired each man to do, and from their intelligent eagerness felt pretty well assured that they would not fail from want of zeal or knowledge of the part they had to play. To the Frenchmen he, of course, explained matters in their own tongue, and found them equally as ready as their Island brethren.

The moon, what there was of it, was fairly low in the heavens, and the long shadows Max counted upon so largely in his plans were much in evidence. Silence was another factor of importance, and the feet of all the men were swathed in long strips of cloth—their puttees in the case of the British soldiers, and strips from their clothing in the case of the Frenchmen.

The band was divided into three groups, and the orders were that on arriving at the edge of the cutting all were to remain motionless in hiding until the guards were changed at midnight. Then three men from each band were to creep up close to one of the three sentries marked down for attack, and wait for an opportunity to seize and kill or capture him without raising an alarm.

The latter point Max insisted upon as of the utmost importance. The groups of three might spend two hours, even three hours, he told them, so long as they performed their task without making a noise that would attract the attention of the sentries on either side. The darkness of the line, from the shadows of the trees and bushes and the deepness of the cutting itself, Max felt he could rely upon to prevent the other sentries from seeing if aught were amiss. The important thing, therefore, was that they should perform their task without noise.

Promptly at midnight the sentries were changed. The momentary bustle was, as arranged carefully beforehand by Max, taken advantage of by the groups of three to creep close up to their objectives. Then things settled down again in quietude. All was peaceful and silent between the thunder of the trains, and time was allowed the sentries to grow accustomed to their surroundings and to develop any individual habits of carelessness that might be theirs. At first the men marched to and fro rather frequently. Later, they contented themselves with leaning on their rifles and making themselves as comfortable as such a position would allow. There had been no attacks on any part of the line in Germany so far as had become known, and there was no reason in the world why these line guards should expect one now.

One of the sentries presently came to a halt in the shadow cast by a tree. He was thus out of sight of his comrades on either side, and the three men in deadly attendance upon him were satisfied that their chance had come. Noiselessly emerging from the shadows, they stole upon him from behind. One seized him by the throat in a grip of iron, stifling all utterance, another pinioned his arms to his sides, while the third caught the rifle which fell from his startled hand. Between the three the struggles of the unfortunate sentry were quickly mastered. He was securely pinioned, gagged, and dragged out of harm's way into the shelter of the bushes.

The capture of one made the capture of the two others comparatively easy. It was only necessary to await a moment when the farther sentinel was facing away from the next man marked down for attack, before springing upon him. One after the other the three guards were successfully placed out of action, and the stern work of reprisal was at hand.

As a precautionary measure, two men, wearing the tunics and helmets of the captured Germans, were stationed as sentries one at each end of the break, to satisfy their German neighbours in case they should miss the sight of the comrades who had gone.