They crossed a little open space, leaped a brook and then entered the woods again. But at a signal from Henry, they stopped a few yards further on.
"Now, boys," he said, "be ready with your rifles. We must stop these dogs. How many do you think they are, Tom?"
"'Bout four, I reckon."
"Then the moment they come into the open space, Tom, you and Paul and Jim shoot at those on the left, and Sol and I will take the right."
The Indian dogs sprang into the open space and five rifles cracked together. Three of them—they were four in number, as Tom had said—were killed instantly, but the fourth sprang aside into the bushes, where he remained. The five at once reloaded their rifles as they ran. Now they increased their speed, hoping to shake off their pursuers. Behind them rose a long, fierce howl, like a note of grief and revenge.
"That's the dog we did not kill," said Paul, "and he's going to hang on."
"I've heard tell," said Tom Ross, "that 'cordin' to the Indian belief, the souls o' dead warriors sometimes get into dogs an' other animals, an' it ain't fur me to say that it ain't true. Mebbe it's really a dead Injun, 'stead o' a live dog that's leadin' the warriors on."
Paul shuddered. Tom's weird theory chimed in with his own feelings. The fourth dog, the one that had hid from the bullets, was a phantom, leading the savages on to vengeance for his dead comrades. Now and then he still bayed as he kept the trail, but the fleeing five sought in vain to make him a target for their bullets. Seemingly, he had profited by the death of his comrades, as his body never showed once among the foliage. Search as they would with the sharpest of eyes, none of the five could catch the faintest glimpse of him.
"He's a ghost, shore," said Tom Ross. "No real, ordinary dog would keep under cover that way. I reckon we couldn't kill him if we hit him, 'less we had a silver bullet."
The savages themselves uttered the war cry only two or three times, but it was enough to show that with the aid of the dog they followed relentlessly. The situation of the five had become alarming to the last degree. They had intended to pursue, not to be pursued. Now they were fleeing for their lives, and there would be no escape, unless they could shake off the most terrible of all that followed—the dog. And at least one of their number, Silent Tom Ross, was convinced thoroughly that the dog could not be killed, unless they had the unobtainable—a silver bullet. In moments of danger, superstition can take a strong hold, and Paul too, felt a cold chill at his heart.