"What do you suppose they will do with our prize?" asked Jack one afternoon about a week after they had returned from their adventurous voyage. He was talking to "Little Mack," who was supervising some repairs to the _Dewey_. The submarine commander's eyes twinkled. "I reckon they'll turn her right in against the Germans," was his reply. "Do you suppose they will man her with a crew from the American fleet?" pursued Jack. "Haven't the least doubt of it," answered his chief. "Some of my boys may be taken to fill up her crew and I wouldn't be a bit surprised if they light on you. "But not with my permission," continued McClure after a pause. Jack was pleased at the compliment and hastened to assure his commander that he hoped always to remain with him for the war. Jack's brave fight to save his captain from the sea in the encounter with the floating mine, together with the experiences they had shared the last two weeks, had endeared these two to each other, and while there was a difference of some ten years in their ages, they were close friends. Commander McClure's surmises as to the disposition of the U-boat were correct, as subsequent events showed. Chief Engineer Blaine and his staff of the _Dewey_ were assigned to the U-boat with orders to familiarize themselves with the operation of the vessel as quickly as possible. American deck guns were being substituted for the German guns and alterations being made in the torpedo tubes to accommodate made-in-america torpedoes. Returning to the naval station one afternoon from shore-leave, Commander McClure drew Jack aside to announce briefly that he had just received orders transferring him from the _Dewey_ to command of the U-boat. Executive Officer Cleary, with a portion of the _Dewey's_ crew, had been detailed to remain in Chatham with the American submarine. It was to undergo extensive repairs after its perilous adventure on the bottom of the sea. "And now I have a surprise for you," smiled "Little Mack," as he took from his inner pocket an official-looking envelope and handed it to Jack. The latter took the proffered envelope and tore it open. What he read therein was enough to make any ambitious young American submarine sailor open his eyes. It was an official order announcing the appointment of Jack as an ensign with an assignment to the captured U-boat as executive officer under Lieutenant-commander McClure! Jack could scarce believe what he read and was so dumbfounded he could not speak for some minutes. "And our friend Wainwright is to be with us, too," continued McClure. "You mean Ted Wainwright?" asked Jack. "Yes, he will be my aide and relieve the wireless operator at times," explained "Little Mack." "As a matter of fact," he continued, "I will ship the most of my old crew on the U-boat. The _Dewey_ will be out of service for some time and Cleary will probably take her out on her next voyage with a brand new crew."