“Wal, mebbe so,” said Bob.

“You see,” added Dick, “if he can’t steal him one time he will another. If he can’t take him to-night, mebbe he’ll ketch the youngster alone on the prairy to-morrer or next day, an’ knock him down an’ make off with the hoss; an’ that would be sartin to raise a rumpus; ’cause if that Injun’s head an’ the sights of my rifle should ever come in line arterwards, the we’pon would go off whether I said so or not, an’ then thar’d be one Injun less.”

“I know;” said Bob, “an’ mebbe its best as it is. Let the Injun have his ole hoss, if he wants him.”

Archie listened in amazement to this conversation and caught every word of it. He knew now why Dick was sorry that he had purchased the horse. He remembered that the trappers had told him a dozen stories illustrative of the propensity on the part of the noble red man to drive a hard bargain in a horse trade, and after disposing of a valuable animal for all he would bring, to steal him at the first opportunity. He knew too why the Indian could not be prevailed upon to sell the horse to any of the officers of the Fort. They were familiar with all the tricks to which he and his kind were addicted, and the horse, once in their possession, would be so closely guarded that he could never get a chance to steal him again. But Archie was a stranger to the prairie and its customs, and a boy besides, and the savage did not think he would run any risk in trading with him.

“And he didn’t run any risk in dealing with me, either,” said Archie, after he had spent a few minutes in thinking the matter over. “But he will run some risk if he tries to steal that horse from me, as sure as he is an Indian. I gave him all the boot he asked—it was a fair, square and honest trade, and he must stand to it.”

Archie threw aside his blankets, drew one of his revolvers from its holster and made his way quickly and cautiously toward the place where his horse was picketed. He held his weapon in readiness to defend his property, should occasion demand it, but there was no one there to dispute possession of it with him—that is, there was no one in sight. There was some one, however, crouching close by in the grass—some one who saw all he did, and who followed behind him at a safe distance as he led the horse away and made him fast to a sapling, which stood in the outskirts of the camp and close beside the wagon. Having done this, Archie removed his blankets, saddle and weapons from the cabin, rearranged his bed under the wagon, and laid down almost within reach of his horse, and in such a position that he could see the smallest object that might attempt to approach him.

“Now, then,” said he, “if that Indian thinks he is smart enough to steal this horse, I am ready to undeceive him. He would stand a much better chance of getting him if he would return those articles I gave him and tell me he wants to trade back. I’d rather give up the horse than be obliged to stand guard over him night and day. But I’ll keep him long enough to have at least one race with Frank, no matter what happens.”

So saying, Archie settled himself into a comfortable position and prepared to go to sleep, intending to wake in time to defeat the Indian’s nefarious designs, if he had any. He knew that when savages intend to make a descent upon a wagon-train, they come just before daylight, for it is generally darkest then, the fires have burned low and the emigrants sleep the soundest. It was about this time that Archie wanted to wake up; and if he succeeded in doing so, he would stand guard over his property until the whole camp was astir.

The excitement occasioned by the conversation he had overheard between the trappers kept him awake for a long time, but sleep overpowered him at last, and then Archie knew nothing for many an hour. The camp fire, which Dick had mended once or twice during the night, had almost died away, the moon was out of sight behind the hills, and the thick darkness which the savage likes best was fast settling down over the woods and surrounding prairie, when Archie suddenly became conscious that there was something going on near him. A faint, rustling sound, as if some one was trying to pass carefully through the bushes, aroused him. Just then a burning ember from the log back of the fire fell off, blazed up as brightly as a candle for a moment, and then went out, making the camp and all surrounding objects look darker by contrast. But Archie, whose eyes were wide open, had seen something in that instant of time. He had seen an Indian crouching in a thicket close to the root of the sapling to which his horse was tied.