"Well," said Lord Hastings as he turned away, having learned all that he desired to know, "I guess we had better get away from this spot or one of your submarines is liable to find us. Mr. Templeton, you may escort the prisoner to your own quarters and place a sailor on guard." Jack led the prisoner to his own cabin and, after stationing a sailor at the door, returned to Lord Hastings. "What have you on your mind, sir?" he asked. "What do you mean?" asked his commander. "Why," said Jack, "I know you were not asking all those questions for nothing." "That is true," was the reply. "I was thinking that by donning German uniforms and going ashore, we might possibly rescue Frank." "I had thought of that myself, sir; and I believe it might be done." "So do I." "Then shall we make the attempt, sir?" "Yes," replied Lord Hastings, "we shall." "Good. When?" "At once. We have no time to lose." "But the submarine. How shall we know where to find her?" "I'll fix that. Send Brennan to me." Jack departed and returned a moment later with Brennan, the chief engineer. "Brennan," said Lord Hastings, "Mr. Templeton and I are going to take the launch and go ashore. As soon as we have gone I want you to submerge just to the edge of the periscope and remain there until you see us returning. Then rise immediately to take us aboard, for we may come in a hurry." "But if an enemy should approach in the meantime, sir?" asked Brennan. "In that case you will, of course, submerge at once, and then, making a detour, return to approximately the same spot. It may be necessary to take chances, but you will have to do that." "Very good, sir," said Brennan, saluting. Lord Hastings turned to Jack. "We'll go to the surface now," he said. "We may as well start at once." Five minutes later, in the little launch, they were skimming over the water toward the shore, which they could just see in the darkness. They felt sure that they had quitted the submarine unobserved. As soon as they were over the side, Brennan, in accordance with instructions, had immediately submerged. Before leaving they had both attired themselves in German uniforms, and felt comparatively safe. The run to shore took perhaps fifteen minutes. When they at last set foot on land their first thought was for a hiding place for the launch. Several trees overhanging the canal at the point where they had landed afforded a slight shelter and into their shadow the launch was pulled. "It's the best we can do, and I guess she won't be seen," said Jack. "At any rate we'll have to take a chance," replied Lord Hastings. "Now let's go." They turned their faces westward, where, in the distance, they could make out the outlines of the German fortifications. "How are we going to know which is Fort Kaiserin?" asked Jack. "We'll have to ask," was the reply. "Won't that give us away?" "I don't think so. We can say we just came here."