During World War I, it is said that some Turkish soldiers tried to steal a flock of sheep from a hillside near Jerusalem. The shepherd, who had been sleeping, suddenly awakened to see his sheep being driven off on the other side of the ravine. He could not hope to recapture his flock by force single-handedly, but suddenly he had a thought. Standing up on his side of the ravine, he put his hands to his mouth and gave his own peculiar call, which he used each day to gather his sheep to him. The sheep heard the familiar sound. For a moment they listened and then, hearing it again, they turned and rushed down one side of the ravine and up the other toward their shepherd. It was quite impossible for the soldiers to stop the animals. The shepherd was away with them to a place of safety before the soldiers could make up their minds to pursue them—and all because his sheep knew their master’s voice.