To Max Durend the successful raid on the coal-yards was only the prelude to the main performance. His mind was bent wholly towards one great object, and that was to prevent, by every means in his power, the exploitation of his father's great works by the enemies of his country. The coal-yard incident, as he termed it, was satisfactory so far as it went, but gave his mind no real relief such as had resulted from the recovery of part of the firm's monetary resources and the destruction of the power-house. The next affair, which, as has been hinted, was already well in hand, was more important and was an attempt to damage, if not destroy, some of the great machines installed for the production of rifles and machine-guns.

The largest workshop in the yard was devoted to this and a few other of the more delicate kinds of work, and it seemed to Max that the greatest amount of injury might be inflicted upon the Germans by an attempt on this shop. The works were still at a standstill, though it was fairly evident that they would not be so for much longer. The attempt ought, therefore, to be made within the few following days.

The plan was simplicity itself. It merely provided for Max and Dale to enter the workshop during the night and to work as much mischief among the machines as they could, consistently with the need for silence and the avoidance or silencing of the watchmen. For some days they had kept the place under close observation, and noted the hours and habits of the watchmen and the sentinels at either end of the building until they knew them as well as the men themselves.

Dubec they would not bring with them. He was eager to come, but the work required alertness and lightness of hand and foot rather than strength, and for this he would have been of no use. Besides, the two lads, keen as they were on their self-imposed tasks, were not unmindful of the fact that he had a wife and children to mourn him should the venture come to grief.

All, however, seemed to go well. Max and Dale succeeded in effecting an entrance into the ground floor of the workshop after they had seen the watchman, by the glint of his lamp, make his midnight round. The two soldiers—one at each end of the building—saw nothing and heard nothing, of that they were assured. Without delay, therefore, for in a little over an hour the watchman would be back from his rounds upon the upper floors, they proceeded to put out of action the more valuable and more complicated machines in the building. It was necessary, of course, that they should be almost silent; so their mode of procedure was to muffle up in an old blanket the most delicate and fragile parts of the machines before smashing them with a heavy hammer well swathed in flannel wrappings.

The machines dealt with first were those farthest from the route that would be taken by the watchman on his next round. Consequently, when he came, he passed along swinging his lantern in utter ignorance that anything was amiss, or that two men lay in ambush close at hand, ready to spring upon him should he suspect anything wrong and pause to investigate. As soon as he had passed out of ear-shot the two recommenced their work with redoubled energy, and some two and a half hours were thus consumed in work that utterly spoiled a large proportion of the valuable machines which filled the great workshop.

Skilful, vigilant, and almost silent as they had been, they were yet after all caught napping. How or by whom they never knew, until, some time after, Dubec told them of a tale that was going the round among the workmen to the effect that one of Schenk's hired ferrets had all the time been hidden on the upper floor. Strange to say, he had been there not so much to deal with disaffected workmen—the sentinels were expected to do that—as to spy upon the watchmen themselves. The story seemed to fit in well with what Max knew of Schenk's character, and he accepted it as in all probability true. At any rate, neither Max nor Dale dreamed that aught was amiss until the latter heard the sound of marching outside, and that upon an unusual scale. He slid quickly to the nearest window and peeped out.

"We're done, Max!" he cried soberly. "Scores of soldiers, and they look to be forming a cordon right round the building."

"Are you sure?" Max cried incredulously, hurrying to a window on the opposite side of the block. One glance was enough to show that a strong cordon of soldiers was being drawn—nay, to all appearances was already drawn—all round the workshop. The soldiers faced inwards, and stood with bayonets fixed, as though prepared for an attempt at escape from some body of men caught within their armed circle.

"We've been seen, Jack, old man!" cried Max, coming back to the side of his friend. "It's all up, I fear. They've made up their minds they've got us, and do not intend to let us slip. I'm so sorry, old man, you should have been mixed up in this. It's really not your quarrel, but mine."