Of course such talk created no end of a sensation among the rough men who were enlisted in the cause of the revolutionists. They feared their commanding general more than any man on earth; and after hearing what Lopez had to say about these American boys, they were ready to give them a wild cheer; especially when told that the newcomers stood ready to cast their lot in with them, and help disperse the enemy.

When the guide, turning to Rob, told him about what he had promised the rebels in return for the protection they were giving the fugitives, the patrol leader looked a bit grave.

"Of course we're willing to do all we can, you understand, Lopez, to help our new friends out; and if anybody is wounded, we know a whole lot about how to take care of bad hurts; in other ways, too, we'll do all we can; but except as a very last resort, I wouldn't want to shoot direct at those men over there. We're not soldiers, even if we do wear a uniform that seems to say we are; and the last thing a Boy Scout wants to do is to fight. But wait and see how things turn out. There are lots of ways we can assist without actually using our guns against the Regulars; though if it came to the worst, and they were charging this fort, you'd soon see how we'd pitch in and do our part."

After that Rob and his three chums noticed that they were being observed with even more curiosity. Later on it turned out that the cunning Lopez, meaning to do things wholesale while about it, had hinted that these young fellows might be secret messengers to Villa coming from Washington; and that there was a strong chance that the American Government was meaning finally to befriend the rebels, even allowing them to get arms at will from across the border. In this way they might be helped to hasten the fall of Huerta, who had never been recognized as president by the new administration.

Meanwhile, the fire of the Federals up there among the rocks had entirely ceased. Tubby, not being versed in such things, believed that the coming of reinforcements, in the shape of four boys and one man, must have given the Federals what he chose to call "cold feet," and that they had betaken themselves off. Rob, however, knew differently, for by using that convenient field glass of his, he could see that there were several men still up there. Evidently some sort of new scheme was being figured out by those who were besieging the train; and unless the defenders managed to learn its nature in advance, they might be given a disagreeable surprise shortly.

This gave Rob an idea.

Just as he had told Lopez, while the scouts would not like to be asked to fire on the enemy, unless the defenders of the train were hard pushed, there were plenty of ways whereby wide-awake young chaps, such as they were known to be, might make themselves useful.

He saw such an opening right then, and quickly began to look into it more closely to find out if it were indeed practicable.

Examining the topography of the country through his glasses, Rob found that it was possible for a smart fellow to climb up to a certain point, where he could observe all that was going on beyond, and doubtless find plenty of chances to transmit his discoveries to the other scouts below by means of a signal flag and the wigwag code. There was Tubby, who had done himself more credit with signal work than along any other line connected with scout activities; why should he not keep himself in readiness to receive whatever news the vidette on the pinnacle of rock chose to send?

After speaking about this idea to Lopez, and asking him to pass it along to the rather fierce-looking individual who seemed to be in command of the rebels, Rob sought out the fat chum.