He struggled to his feet, and commenced once more to clamber up the rude fortification, at the same time shouting at the top of his voice. This was done with a purpose, for he understood full well that, like most cowardly animals, wolves greatly fear the voice of man.

Bob, too, was exerting himself to the utmost. Again came that tremendous crash, as the second musket was discharged close to Sandy's ear.

Then an eager hand laid hold of him, and he felt himself dragged over the topmost log!

Both boys were panting for breath, but, thrusting one gun into Sandy's hands, Bob started to hastily reload the other. They could hear their enemies not ten feet away, snarling and snapping terribly. It needed no explanation to tell Sandy what was going on out there in the snow; for he knew that wolves are cannibals if pressed with hunger.

"It was a pretty close shave, Bob!" he exclaimed, after he had rammed a bullet home in his gun, and fixed the priming in the pan.

"And a foolhardy act," returned the other, gravely. "If you had missed your footing a second time you would have been pulled down in spite of all I could do, and that would have been the end of us."

Sandy felt abashed. He knew perfectly well that he had been guilty of a reckless feat that might have cost both of them their lives; for without doubt Bob would have leaped over the barrier to his assistance, and shared his sad fate.

Perhaps thoughts of the dear ones at home, who would have mourned them so grievously, may have caused the boy to resolve upon a wiser course the next time he found himself tempted to take hazardous chances.

They stood on guard, and waited to see what their enemies would do when they had finished their meal.

"I hope they will go away, and leave us alone," said Sandy, uneasily.