Tom was right. The wolf, wounded in the left flank, had suddenly appeared. His eyes blazed with pain and fury, and he made as if to spring upon the boys.

Tom was in front of the sled and Sam behind it. With a quick leap Tom cleared the load and took up a position beside the youngest Rover.

The wolf made the leap, but stopped short on the top of the load. As he prepared to spring again Tom swung his gun around by the barrel and hit the wolf a smart rap on the head. The animal rolled over on the ground.

"Shoot him, Sam!"

"I will, if I can!" came from Sam, who had now unslung his gun. Taking a quick aim, he fired.

The shot proved a good one, for it took the wolf directly in the neck, just as he was scrambling to rise. Again he gave a yelp, and then began to turn over and over in his intense pain. Of a sudden he leaped up and landed on Tom's shoulder.

For the instant poor Tom thought his last moment had come. But as the beast landed Sam struck it with his gun, and down it went once more, snarling viciously. Then it rolled and tossed until some brush was gained, when it managed to hide itself and crawl away, seriously, if not mortally, wounded.

"He's gone!" came from Sam.

"Well, don't go after him," panted Tom. "Let him go and welcome. I never want to see him again."

"Nor I."