“Oh, well, the guards are on duty, and are looking out for anything of that kind,” said Andy carelessly. “The visit from that aeroplane will put them on their mettle.”

“Unless,” Rob ventured thoughtfully, “they considered that the pilot was merely some venturesome American who had taken chances in crossing the boundary air, and found himself over Canada. It might be their shots were only sent to warn him he had better clear out, and to mind his own business.”

“Whee! In that case they might be caught napping,” said Tubby, with a vein of anxiety in his voice. “Rob, would it be any business of ours to warn the Canadians guarding the trestle or bridge, if we had the chance?”

“It would be our patriotic duty, if we really knew that mischief was brooding,” the scout master told him sternly. “Stop and think for a minute, and you’ll see it in that way too. First of all, as true scouts, we would have to consider that these men, no matter how much they loved the land of their birth across the sea, are either citizens of the United States, or even if Germans, are enjoying the hospitality of Uncle Sam. To creep across the line so as to strike at their foe would be to abuse that hospitality. Yes, it would be the duty of any honest, patriotic American citizen to give warning, if he absolutely knew that such a scheme was afoot.”

“Do you mean to carry the news to some town in Maine, from where it could be wired to Washington, so that soldiers might be sent up here to frustrate the evil designs of these schemers?” asked Tubby, who at times delighted in framing his questions in exceedingly weighty language.

Rob Blake reflectively rubbed his chin as he considered this query.

“I’m afraid that would consume far too much time, Tubby,” he finally replied. “Before those troops could be rushed here from the nearest army post the mischief, such as it was, would have been carried through. No; if I learned positively that those German sympathizers meant to invade Canada, something the same way as the Fenians did a long time ago, I’d consider it my bounden duty to cross the line myself and try and warn the guards at the bridge.”

“That’s the ticket, Rob!” cried the delighted Andy, who himself believed in “hitting the nail on the head.” Tubby, a bit slower to grasp possibilities, bent closer, the better to hear what was said.

Much more was spoken of along these lines, but the reader has already learned what the boys, as young American patriots, were bent on doing should the occasion arise, and hence it is not necessary to repeat all that passed between them.

Of course they also talked of other things, returning to this fascinating theme from time to time. Often Tubby stared in the direction of the North Star, in company with the Great Bear or Dipper constellation; and at these times his round, rosy face registered an expression of awe. Tubby might have been gifted with a sense of second sight, and dimly may have seen possible complications they were fated soon to meet.