"We will run due west a quarter of a mile," said Lord Hastings to Frank, "and when I give the word flash your searchlight in all directions. The flash should blind the lookout on the enemy, and I will follow the sweep of your light with the torpedo. The moment I catch sight of the enemy I'll launch it, and we'll rise instantly." Frank signified that he understood, and rapidly the submarine steamed ahead. "Now!" cried Lord Hastings suddenly. Frank released the powerful rays of the searchlight, and swept the sea to his right. There was nothing to be seen. Then he swept the sea to the left, and, less than a quarter of a mile away, the Austrian submarine was bearing down on them. Lord Hastings, who had followed the searchlight with the torpedo, immediately launched it, and then, springing outside, gave the command to rise. The D-16 leaped to the surface like a thing of life. Lord Hastings took Jack's place at the periscope. "Guess we got him that time," he said. "Hope so," replied Jack briefly. "I don't see," began Lord Hastings, "how--down quick!" The submarine dropped like a log, and Jack exclaimed: "What's the matter?" "Missed her again," said Lord Hastings grimly. "Why didn't you launch another when she bobbed up?" "Because I was afraid she might do so first." "Well," said Jack, "I have an idea that I believe will end this hide and seek business." "Let's have it." "Then let's go up. As soon as the enemy sight us, he will go down, expecting us to do likewise. But we'll fool him. We'll just shift our position a trifle--enough to be out of the way of a possible shot. Then we'll wait for him to come up again. In the meantime we'll train all our tubes along the water where he is likely to reappear. The moment he does so, you call the number within range and we'll get him." "We'll try it," said Lord Hastings briefly. Once more the signal was given to rise, and as the D-16 came to the surface, Lord Hastings, through the periscope, saw the periscope of the enemy go down. Quickly the course of the D-16 was changed just enough to avoid a torpedo should one be fired by the enemy. Then Lord Hastings directed the training of the different torpedo tubes aboard the D-16. All in readiness, they waited. Suddenly Lord Hastings saw something emerging from the water. No. 2 torpedo was aimed directly at this point. Lord Hastings wasted no time. "No. 2!" he called. "Click!" There was no waiting for the command to fire. There was no time for it. It had been Lord Hastings' intention to submerge immediately the torpedo had been launched, but so great was his confidence that this torpedo had gone home, that he allowed the submarine to remain on the surface. "Did we hit her, sir?" cried Jack. "She's gone," was the reply, "but I can't tell yet. If she comes up again we'll give her another." Three minutes later and Lord Hastings gave vent to an exclamation of satisfaction. "We got her," he cried.