By this time they were all watching the new menace. Brissac's description fitted it accurately; a cylindrical object mounted upon a pair of small wheels taken from the commissary store-room truck. It came toward the Nadia by curious surges--a rush forward and a pause--trailing what appeared to be a long iron rod behind it. Ford hit upon the explanation. The cylindrical thing was another gas-pipe bomb; the iron tail was a smaller pipe containing and armoring the fuse, and serving also as the means of propulsion. They were coupling on additional lengths of the fuse-carrying pipe as they were needed; hence the jerking advances and pauses. Adair's low laugh was as care-free as ever. "A practical illustration of the tail wagging the dog," he remarked. "But the dog will wag us good and plenty when they get him where they want him. You can't fish that thing up through the hole with your wire--or crop the tail." "No; it's a run for it, this time," said Ford, rising and stripping his coat. But Brissac was pointing to three or four men dodging from shadow to shadow under the masthead lights and circling wide to tighten the line of circumvallation. "We shan't run very far," he commented. It seemed a hair-graying age to the watchers at the Nadia's windows before the men behind the commissary barricade got their infernal machine placed to their liking. They stared at it, all three of them, fascinated, deaf and blind to all else. A minimized shudder as of drumming wheels or escaping steam was in the air when they saw the flare of the match that betokened the firing of the fuse, but no one of the three heard it. It was when the sputtering line of fire had buried itself in its tube that they became suddenly alive to the unbelievable fact that a locomotive was thundering down the yard on the Nadia's track. A rifle cracked; then another and a third; but the engine came on as if its driver bore a charmed life. Surely Michael Gallagher must have prayed to the saints that night. He did not know that the very seconds had become priceless: he knew only that Frisbie had sent him on ahead to snake the president's car out of the Horse Creek yard as quickly as possible. Yet if he could have seen the bomb and the sputtering fuse, he could not have slowed more deftly to let the automatic couplers clutch each other, nor, at the touch and clamp, could he have reversed and gathered headway with greater skill. The three occupants of the Nadia staggered to their feet as the private car lunged ahead in the grasp of the big engine, increasing speed with every wheel-turn. Mechanically, and as one man, they rushed to the rear platform. The mock cannon stood where it had been thrust; but in the camp street a handful of men were wrestling madly with the pipe fuse-carrier, breaking it, wrenching it in pieces, and stamping futilely upon the snake-like thing hissing and spitting under their feet.