Rob understood what doubts and fears were racking that faithful heart. He also had a plan whereby Donald might make assurance doubly certain. The time had apparently arrived when a division of their forces would appear to be the best policy.
“Listen, Donald,” said Rob, still in that low whisper that even the other fellows could not catch, though they tried very hard to do so, “you must climb the bank, and, perhaps, find one of the guards. Failing that, you can run back along the track so as to warn your father of the danger. You know how to do that, and here is my little torch you might use, also some matches, my red bandanna to put over the light as a danger signal, and a part of a newspaper. Do you get my meaning clearly, Donald?”
“Oh! ay,” said the eager boy, as he clutched all that Rob was thrusting into his hand. “Shall I go the noo, Rab?”
“Yes, be off with you,” came the command. “Be careful how you stand up when you reach the top of the embankment. The enemy are hiding down here, and would outline you against the sky. Crawl all you can, Donald. Good-bye, and good luck go with you. Meanwhile, depend on us to find that wire!”
A fervent clasp of the hand. Donald crept hastily away, heading so as to reach the bank at the terminus of the trestle; for, of course, he could not hope to climb the latter itself.
Andy was able to partly guess what mission Rob had given into the keeping of the young Canadian. Possibly Andy would have liked being sent forth on such an exciting errand himself, but then he recognized the fact that Donald really had a superior claim to such a task. He was at home on his native heath, and could better make the Canadian guards understand, if he had the good luck to come upon any of those in whose care the bridge had been placed by the authorities. Then, again, it was his father whose life was in danger. Another thing satisfied Andy that Rob knew what was best in selecting Donald for action—being brought up in a railroading family he was apt to be much better acquainted with the ways by which signals are given calculated to stop trains. Yes, Donald was the proper one to be chosen, Andy concluded, and, as usual, Rob had wisely placed “a round peg in a round hole.”
After their force had been diminished, the rest of the party continued their hunt for the hidden wire. Rob knew just about how it would be staked down as close to the earth as possible, by means of metal staples, or wickets like those used in the game of croquet, only much more diminutive. This would be done in order to prevent any passer-by from catching his foot in the wire, and thus bringing about an astonishing discovery that would break up all the plans of the plotters.
So Rob was feeling very carefully. He did not mean to miss anything while engaging in the search. He was also positive that they ought to run across the wire at any second.
But once more the breeze brought the sound of the approaching train more plainly to their ears. It was coming fast, they understood. In imagination Tubby could see the glare of the headlight in the west, though a second look convinced him he was probably mistaken, and that it was only one of the largest planets about setting below the horizon. After that he breathed freely again.
If Donald were only successful in meeting one of the guards, and could explain matters in a great hurry, a man might be sent down the track to wave a red lantern and thus stop the oncoming train. Failing in that, Donald must do the best he could with what Rob had provided for the purpose.