“Halt!” he said sternly.

Lord Hastings stopped in his tracks.

“What’s all the row back there?” demanded the sentry.

Lord Hastings would have replied, but Jack did not give him time.

Stepping suddenly from behind Lord Hastings, he dived at the German’s legs. He had gauged the distance accurately, and the two went to the ground violently. The sentry’s gun was discharged, but the bullet whistled harmlessly over Lord Hastings’s head.

“No time to fool with him, Jack!” cried Lord Hastings. “Here come the others. Hurry!”

Jack raised his opponent’s head in his two hands, then bumped it against the ground.

“There,” he said, rising, “that’ll keep him for a while.”

He hurried after the others, who had jumped into the boat.

“Cut the line there—quick!” commanded Lord Hastings.