Again silence was necessary, for if Miguel was coming it would not be long before his arrival. Come he did and only a few yards from them. Bob held his breath until Miguel passed them and reached the river level. There he put down his package, which Bob noticed he handled with the utmost care. But this did not impress the boy as much as did the next move of the man under observation. Going up to a rock which showed itself above the ground, he knelt and began scooping away the sand from one side of it. After a few moments of this work he evidently found what he had been digging for, because he picked some objects out of the hole he had made and laid them at his side.
Involuntarily Bob gasped. He recognized what it was that Miguel had taken from the hole and what probably was also in the odd-shaped package he had been carrying.
It was dynamite, dynamite stolen probably from the work and brought up and stored here for some evil purpose. Evidently Miguel was preparing to strike the first blow in the plot against the dam.
Bob kept still, feeling that he would soon know what Miguel planned to do with the explosive, for if whatever plan the Mexican had conceived was not to be consummated to-night, it was evident that he would have buried the additional stuff he had brought instead of digging up his cache.
In this he was not mistaken. Miguel produced from around his body a coil of fuse and began joining the sticks of dynamite and placing detonating caps in them. Every muscle in the boy’s body ached to jump from the hiding place and grapple with the man who was arranging such wholesale destruction, but evidently the Indian realized what was going on within him, for he felt a restraining touch on his arm. At once he knew what it meant. The Indian was telling him that it would be foolish to attack the Mexican when he had so much sudden death in his hands. Before they could reach him, no matter how swiftly they acted, the Mexican could throw the dynamite and the damage would be done. There was nothing to do but wait and hope that Miguel would give them an opening when there was more possibility of averting the catastrophe.
The Mexican worked swiftly and at last he had his infernal machine ready. Straightening up, he carried it to the coffer dam and began laying the dynamite sticks at equal intervals along the bank. This dam was constructed of timber backed up by refuse material from the crusher and the excavation. It was neither high nor wide at this time as it only served to divert the ordinary flow of the Rio Grande. It had not been destined to cope with any flood, should one come, as the engineering plan was to get the dam in such shape as to withstand a freshet before the rainy season came on. But the dynamite the Mexican was laying was sufficient to wreck what had been built, and, should the water be released, it would undo thousands of dollars worth of work at the main dam, besides the delay caused by the rebuilding.
It was the first blow in the Mexican campaign and at all hazards it must be stopped. Bob knew this and the Indian at his side knew it. Miguel went farther and farther from them towards the center of the river. They could follow him with their eyes as his movements were clearly outlined in the white moonlight. There was no watchman on the coffer dam. There seemed no reason for one; yet Bob realized that a watchman was needed everywhere with this plot seething.
It was a horrible situation, for there seemed to be nothing that could be done. Probably the Mexican was desperate enough to sacrifice his life if he should be detected while laying his mine. He would set off the dynamite if he saw anything to disturb him. Therefore, to attack him openly seemed out of the question.
What was to be done? There seemed no answer. At last an idea came to Bob. “Go quick,” he said to the Indian, “get help! Bring a gun. Perhaps we can shoot him! I’ll stay here and watch. You can go quicker than I. Hurry!”
Feather-in-the-Wind knew it to be the only plan and started off with long running leaps, keeping himself well hidden from the Mexican. There was just a chance that he could get to the camp and back before Miguel could complete his dastardly work.